UNC Charlotte MEGR 3161-002 Materials, Test 2 Study Guide

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0 [{"id":311136,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 20:15:53","updated_at":"2017-10-28 21:02:25","questionName":"A polycrystalline metal with finer grain size is stronger (that is, it has higher yield strength) than a coarser-grain counterpart because:","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":19,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311145,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 20:34:28","updated_at":"2017-10-28 21:02:25","questionName":"The most important assumptions of Griffith theory for brittle fracture include:","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":28,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311140,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 20:24:10","updated_at":"2017-10-28 21:02:25","questionName":"When a plastically deformed metal is annealed at elevated temperatures, the three stages that occur, in the appropriate order, are","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":23,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311138,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 20:21:03","updated_at":"2017-10-28 21:02:25","questionName":"Among the typical strengthening mechanisms, the following will increase the yield strength and toughness concomitantly: ","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":21,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311133,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 20:12:23","updated_at":"2017-10-28 21:02:25","questionName":"The yield strengths of metals are much smaller than the theoretical strength because:","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":16,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311134,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 20:13:23","updated_at":"2017-10-28 21:02:25","questionName":"All metals, regardless of their crystal structure, have the same ability of plastic deformationat the same temperature.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":17,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311137,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 20:17:49","updated_at":"2017-10-28 21:02:25","questionName":"All strengthening mechanisms are at the cost of fracture toughness. ","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":20,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311139,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 20:23:30","updated_at":"2017-10-28 21:02:25","questionName":"For a polycrystalline metal to have uniform plastic deformation under stress, the metal should have at least the following number of independent slip systems:","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":22,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311132,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 20:10:53","updated_at":"2017-10-28 21:02:25","questionName":"The ability of a metal to plastically deform depends on:","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":15,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311142,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 20:28:38","updated_at":"2017-10-28 21:02:25","questionName":"Ductile failure means there is a large plastic deformation before failure. Brittle failure means there is little plastic deformation before failure. ","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":25,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311141,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 20:26:34","updated_at":"2017-10-28 21:02:25","questionName":"During recovery of a plastically deformed metal, the following processes occur:","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":24,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311143,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 20:31:47","updated_at":"2017-10-28 21:02:25","questionName":"See the following fracture surface images of two materials.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":"uploads\/unc-charlotte-megr-3161-002-materials-test-2-study-guide\/quizzer..PNG","position":26,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311135,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 20:14:12","updated_at":"2017-10-28 21:02:25","questionName":"A single crystal metal will yield at the same stress level regardless of the orientation in which it is loaded. In other words, the yield strength of a single crystal metal is a constant and will not depend on the direction in which the stress is applied.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":18,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311146,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 20:35:03","updated_at":"2017-10-28 21:02:25","questionName":"For a completely brittle material, a crack of any size will grow under any applied stress.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":29,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311144,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 20:32:16","updated_at":"2017-10-28 21:02:25","questionName":"The higher the ductile-to-brittle transition temperature of a metal, the better its fracture toughness.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":27,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null}]
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A polycrystalline metal with finer grain size is stronger (that is, it has higher yield strength) than a coarser-grain counterpart because:

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