北京科技大学材料力学自学习题及答案

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1、第一章绪论 第1题  第2题  第3题  第4题 1-1图示圆截面杆，两端承受一对方向相反、力偶矩矢量沿轴线且大小均为M的力偶作用。试问在杆件的任一横截面m-m上存在何种内力分量，并确定其大小。解：从横截面m-m将杆切开，横截面上存在沿轴线的内力偶矩分量Mx，即扭矩，其大小等于M。 返回1-2如图所示，在杆件的斜截面m-m上，任一点A处的应力p=120MPa，其方位角θ=20°，试求该点处的正应力σ与切应力τ。解：应力p与斜截面m-m的法线的夹角α=10°，故σ＝pcosα=120×cos10°=118.2MPaτ＝psinα=120×sin10°=20.8M

2、Pa 返回 1-3图示矩形截面杆，横截面上的正应力沿截面高度线性分布，截面顶边各点处的正应力均为σmax=100MPa，底边各点处的正应力均为零。试问杆件横截面上存在何种内力分量，并确定其大小。图中之C点为截面形心。thereportontheworkofvariousdepartments,superviseandinspectthemanagementandprojectimplementationandresultsofimplementingfinancialplansofthecompany,effectivecorrectivemeasuresto

3、ensuretheachievementofbusinessobjectivesfortheyear;1.4theobjectivefixed:accordingtomarkettrendsandemergingissueswithinthecompany,calledspecialtopicsinbusinessmanagementstrategysessionon...2.6compensationandbenefitsmanagement:policyformulation,improvethepayandbenefitssystemanddevelop

4、payrollandstaffbenefitsinatimelymanner;2.7performancemeasurementthroughrationaldesignmethodsofperformanceevaluation,objectiveandfairassessmentoftheworkofthestaff,toimprovetheiremployees'work,andcontinuousupgradingoftheworkingmethodsandquality;2.8employeescareerplanning:accordingtoth

5、erealitiesandthedevelopmentofthecompanyanditsneeds,identificationofoccupationalneeds,combinedwiththeactualdesignforitsdevelopmentgoals,accordingtoimplementcommunicationwithstafftomodifyemployeedevelopmentgoals;2.9archives:archivesofthestatisticsofreasonableandeffectivemanagementtoen

6、surehuman123PP考资料网@http://www.ppkao.com@资料分享平台解：将横截面上的正应力向截面形心C简化，得一合力和一合力偶，其力即为轴力FN=100×106×0.04×0.1/2=200×103N=200kN其力偶即为弯矩Mz=200×(50-33.33)×10-3=3.33kN·m 返回 1-4板件的变形如图中虚线所示。试求棱边AB与AD的平均正应变及A点处直角BAD的切应变。解： 返回thereportontheworkofvariousdepartments,superviseandinspectthemanagementan

7、dprojectimplementationandresultsofimplementingfinancialplansofthecompany,effectivecorrectivemeasurestoensuretheachievementofbusinessobjectivesfortheyear;1.4theobjectivefixed:accordingtomarkettrendsandemergingissueswithinthecompany,calledspecialtopicsinbusinessmanagementstrategysessi

8、onon...2.6compensat