Pratique du Shadowing: Hard Fasteners - Apprendre l'anglais à l'oral avec la vidéo
Création de la leçon...
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a typical fastener weighs about one and three -fourths grams
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but together the 2 .5 million rivets and fasteners in a 747 weigh almost five tons that's why in the airplane industry,
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using the fastener with the right amount of strength and the least amount of weight is critical.
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Rivets are lightweight, easy to install, and inexpensive, but they don't always have the needed strength.
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And that's when you use hard fasteners.
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Hard fasteners differ from rivets in two major ways.
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They're made of titanium or steel while the rivet is usually aluminum and hard fasteners have two parts a bolt
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and a nut that has to be torqued
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or swaged many hard fasteners are self -torquing meaning
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that the nut is designed to tighten to a given clamp
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up pressure some have to be torqued manually let's take a closer look starting from the top down there's the head
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the head to shank fillet the radiused area below the head
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the shank or grip the area between the head and the threads
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the transition the tapered area at the end of the shank
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and the locking mechanism usually threads
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or rings what kind of fastener is this the head has
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the manufacturer's serial number engraved on it The Part Standards Manual converts that number to a BAC number.
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The Illustrated Fastener Reference Manual tells us how to read that number and identifies the type and the material,
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the diameter, the type of coating, and the grip length.
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Hard fasteners come in shear or tension strengths.
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shear strength means the fastener is designed to withstand sideways stress
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tension strength means the fastener is designed to withstand pulling or compression stress
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tension fasteners have larger heads to distribute stress over a bigger area
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shear fasteners save weight because they require a shallower countersink and therefore thinner their structure.
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There are six main types of hard fasteners used at Boeing.
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Lock bolts, high locks and highlights,
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eddy bolts, radius lead -in bolts,
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external wrenching bolts, and recess drive bolts.
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Let's take a look at lock bolts and how they work.
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Lock bolts are self -torquing fasteners.
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When used on primary structure, they're usually made of titanium, sometimes steel.
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Lock bolts are easy to install.
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They're often used in open areas as the lock bolt puller is bulky and therefore difficult to use in less accessible areas.
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Lock bolts come in standard weight and lightweight, the difference being a shorter transition on the lightweight.
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The lightweight can be identified by the yellow color coating on the tip.
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The standard lock bolts come in shear and tension strengths, whereas the lightweight only come in a shear strength.
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At first glance, a lock bolt looks like a threaded bolt, but What appear to be threads are actually rings.
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Tension lock bolts use more rings than shear lock bolts to give the aluminum collar more gripping surface.
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Here's how the lock bolt works.
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The lock bolt is inserted and a collar is slipped over the pin.
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The lock bolt puller grips the pin and pulls on it.
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As it pulls, the tool anvil swages the collar into the locking grooves.
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The tool continues to pull and the pin breaks off.
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Because the lock bolt has rings and not threads, the lock is very strong.
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The collar cannot vibrate off as is possible with a threaded bolt.
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HiLocks and HiLights use self -torquing nuts or collars.
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They can often be used interchangeably with lock bolts.
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They cannot be installed as quickly as lock bolts, but can be used in less accessible areas.
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HiLocks come in a variety of sizes and in standard and lightweight.
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The lightweight versions are called highlights.
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They can be identified by the orange color coding on the tip.
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Like the lightweight lock bolt, the highlight has a shortened transition.
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The shortened bolt then requires a shorter collar.
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To give you an idea of how much weight the highlights save,
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On the 747 -400, using these fasteners instead of Hilux saves over 1 ,000 pounds.
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Here's how a highlight works.
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The bolt is inserted and the collar is started.
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The tool has an alum wrench that keeps the bolt from spinning while the collar is threaded.
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The hex portion of the collar automatically breaks off when the correct torque is reached.
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If the bolts are difficult to access, then the collar won't work, and a self -locking steel nut must be installed manually with a certified torquing tool.
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Eddy bolts are also self -torquing fasteners.
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They're often used in work with composites because they use titanium collars.
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Aluminum collars can cause corrosion on graphite composites.
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Eddy bolts come in sheer and tension strengths.
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All Eddy bolts have the shortened transition for weight savings.
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An Eddy bolt has five grooves, or flutes, equally spaced around the threads.
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The nut has three equally spaced lobes.
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the bolt is inserted and the nut threaded.
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Torque is applied and at the correct clamp -up pressure, the lobes on the nut compress into at least one of the flutes in the threads.
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The eddy bolt lock is very strong and cannot vibrate off.
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Radius lead -in bolts are used primarily in the wings.
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They have tighter tolerances and generally make a stronger installation.
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Two types of radius lead -in bolts are the WQ and the WR.
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The WQ is countersunk so that the head is aerodynamically flush the WR has a protruding head.
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Here's how they work.
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The bolt is driven into the hole with a rivet gun and the nut is torqued.
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In most applications, radius lead -in bolts are designed to co -work the hole.
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The bolt compresses the material inside the hole, making it stronger structurally.
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Radius lead -in bolts are used in high -stress areas and provide a high -fatigue life.
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External wrenching and recess drive bolts are probably the most familiar fasteners.
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Many are just like bolts you find at the hardware store.
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The main difference between these fasteners and all others is that they are not self -torquing.
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Common types of external wrenching bolts include hex head, 12 -point, T -head, and wing head.
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Some come drilled for use with lock wire or cotter pins.
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External wrenching bolts can be torqued from both the head side and the nut side.
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Common types of recess drive bolts include high torque, hex socket, torque set, and Phillips.
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Recess drive bolts are normally torqued from the head side into a nut plate.
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One advantage of using external wrenching and recess drive bolts is that they can be removed and reinstalled if need be.
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Hard fasteners often require the use of washers for grip adjustment, damage protection, corrosion prevention and fillet relief.
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All hard fasteners have fillet relief requirements.
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Remember the head -to -shank fillet?
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The radius prevents the fastener from seating properly.
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The hole must be chamfered to accommodate the fillet.
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Now the fastener will seat properly.
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A washer can be used instead of chamfering, but because of weight savings, chamfering is preferred.
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Your work with hard fasteners can be checked with various types of gauges.
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They are color -coded for the different types of fasteners.
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What the gauge does is measure pin protrusion to tell you whether or not you have the proper grip -link fastener.
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Two and a half million rivets and fasteners, each with a specialized function, strength, and weight.
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Each a critical part of the airplanes we build.
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We'll be right back.
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We'll be right back.
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Oh, oh, oh, oh.
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Vocabulaire et conseils d’expression pour cette leçon
Cette leçon d’expression orale de niveau C1 s’appuie sur la vidéo « Hard Fasteners ». Les mots qui reviennent le plus souvent : bolt, fastener, lock, collar, nut. Cette vidéo contient 103 phrases et 1240 mots à répéter en shadowing. La partie parlée dure 11:42. Le locuteur parle lentement, environ 106 mots par minute, ce qui laisse le temps d’imiter chaque son. Seuls 69 % des mots font partie des 3 000 mots les plus courants en anglais, le vocabulaire est donc exigeant.
Vocabulaire clé de cette vidéo
Les 15 mots les plus avancés de la vidéo, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| bolt nom | /boʊlt/ | boulon, vis |
| fastener nom | /ˈfɑːsənə/ | fermeture |
| torque nom | /tɔɹk/ | couple |
| collar nom | /ˈkɑlɚ/ | col |
| lightweight nom | /ˈlaɪt.weɪt/ | poids léger |
| eddy nom | /ˈɛd.i/ | contre-courant, remous |
| rivet nom | /ˈɹɪvət/ | rivet |
| shear verbe | /ʃɪɚ/ | tondre |
| radius nom | /ˈɹeɪ.di.əs/ | radius |
| shank nom | /ˈʃæŋk/ | jambe |
| distress nom | /dɪˈstɹɛs/ | détresse |
| chamfer nom | /ˈt͡ʃæm.fə/ | chanfrein, champfrain |
| shorten verbe | /ˈʃɔɹtn̩/ | raccourcir, écourter |
| titanium nom | /taɪˈteɪni.əm/ | titane |
| insert verbe | /ɪnˈsɝt/ | insérer, introduire |
Prononciation à surveiller
Le locuteur utilise 8 contractions et formes réduites, comme they're, we'll, don't. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Les sons « sh » et « zh »: shear /ʃɪɚ/, shank /ˈʃæŋk/, shorten /ˈʃɔɹtn̩/, corrosion /kəˈɹoʊʒən/, washer /ˈwɒʃə(ɹ)/
- Mots longs — placez bien l’accent: titanium /taɪˈteɪni.əm/, aluminum /əˈlu.mɪ.nəm/, manually /ˈmænj(u)əliː/, inexpensive /ˌɪnɪkˈspɛnsɪv/, accommodate /əˈkɑməˌdeɪt/
Les sons difficiles pour les francophones :
- /tʃ/ et /dʒ/ — à ne pas adoucir en « ch » et « j »: wrench /ˈɹɛnt͡ʃ/, chamfer /ˈt͡ʃæm.fə/, swage /ˈsweɪd͡ʒ/, gauge /ˈɡeɪd͡ʒ/, adjustment /əˈd͡ʒʌst.mənt/
- /r/ anglais — langue recourbée, sans frotter la gorge: torque /tɔɹk/, rivet /ˈɹɪvət/, wrench /ˈɹɛnt͡ʃ/, radius /ˈɹeɪ.di.əs/, recess /ˈɹiˌsɛs/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Répétez phrase par phrase à vitesse normale, en reprenant chacune jusqu’à ce que votre rythme corresponde à celui du locuteur.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme bolt, fastener, torque.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.