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

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0 [{"id":311124,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 19:32:47","updated_at":"2017-10-28 21:02:25","questionName":"When deriving the relations between the true and engineering stresses and strains, we use the following basic assumption:","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":7,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311129,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 19:37:53","updated_at":"2017-10-28 21:02:25","questionName":"The following statement is always correct: The stronger a material, the more energy is needed to fracture it.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":12,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311131,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 19:39:46","updated_at":"2017-10-28 21:02:25","questionName":" If we load an annealed metal such as copper beyond its yield strength into the plastic regime, and unload to zero stress. During reloading of the metal, its yield strength will be","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":14,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311127,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 19:36:28","updated_at":"2017-10-28 21:02:25","questionName":"If the Vickers hardness number of a metal is measured to be 600 (kg\/mm2 ), then its yield strength is roughly ","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":10,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311130,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 19:38:30","updated_at":"2017-10-28 21:02:25","questionName":"To find the parameters in the Hollomon equation (), we use stress-strain data from nK\uf073\uf065\uf03d\uf0d7the plastic regime before necking of the","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":13,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311125,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 19:33:30","updated_at":"2017-10-28 21:02:25","questionName":"By definition, resilience is the capacity of a material to absorb energy when it is deformed elastically and then, upon unloading, to have this energy recovered. Therefore, the modulus of resilience, Ur, is a constant like the Young\u2019s modulus, and cannot be changed by heat-treatment or plastic deformation.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":8,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311121,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 19:27:04","updated_at":"2017-10-28 21:02:25","questionName":"If a prismatic member is under uni-axial loading in the x-axis,then in the y-and z-directions, there will be no strains.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":4,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311119,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 19:26:04","updated_at":"2017-10-28 21:02:25","questionName":"The stress-strain curve of any elastic material must be a straight line.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":2,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311118,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 19:25:20","updated_at":"2017-10-28 21:02:25","questionName":"The Young\u2019s modulus of a material at a certain temperature","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":1,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311117,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 19:23:17","updated_at":"2017-10-28 21:02:25","questionName":"If the true stress of a prismatic member under uni-axial tension is defined as the force divided by the instantaneous cross-sectional area of the member, then the true stress should always be","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":0,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311126,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 19:34:30","updated_at":"2017-10-28 21:02:25","questionName":"Hardness is defined as","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":9,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311123,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 19:31:17","updated_at":"2017-10-28 21:02:25","questionName":"When the strain is small, the differences between the engineering quantities (strain and stress) and the true quantities are very small, too.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":6,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311122,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 19:30:47","updated_at":"2017-10-28 21:02:25","questionName":" The tensile strength of a material is","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":5,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311128,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 19:37:13","updated_at":"2017-10-28 21:02:25","questionName":"For a given specimen under uni-axial compression, the true stress-strain curve is ","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":11,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":311120,"quiz_id":"15794","answer_id":null,"answerType_id":"0","created_at":"2017-10-28 19:26:38","updated_at":"2017-10-28 21:02:25","questionName":"Hooke\u2019s law applies to any elastic material.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":3,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null}]
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When deriving the relations between the true and engineering stresses and strains, we use the following basic assumption:

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