Lesson1IntroductiontoMechanicsofMaterials材料力学mechanicsofmaterials材料强度strengthofmaterials轴向受力杆件axially-loadedbars应变strain应力stress变形deformation临界荷载criticalload拉压剪tensioncompressionshear等直杆件prismaticbar轴力axialforce隔离体freebody拉力tensileforce截面crosssection形心centroid无量纲的量nondimensionalquantity可变形的deformable装配,集合assembly推论derivation方程equation性能property棱柱的prismatic液体静力学的hydrostatic集度,强度intensity合力resultant静力学statics伸长,延长elongationLesson2TypesofBeamsandStressResultantsinBeams横截的transverse对称symmetry弯曲bending不对称的unsymmetrical/asymmetrical销轴pin滚轴roller移动translate水平地horizontally支撑,支持sustain嵌住的built-in悬臂梁cantilever悬臂overhang均匀的,一致的uniformly力偶couple约束restraint柔性的flexible法向的,正态normal图像diagram对称轴axisofsymmetry简支梁simplysupportedbeam(simplebeam)集中力concentratedforce分布力distributedload均布荷载uniformlydistributedloa