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1、第一单元 应力与应变 That branch of scientific analysis which motions, times and forces is called mechanics and is made up of two parts, statics and dynamics. 研究位移、时间和力运动乘力是科学分析法的一个分歧，被称作力学，力学由两大部 分组成，静力学和动力学。 For example, if the force operating on a sleeve bearing becomes too hi
2、gh, it will squeeze out the oil film and cause metal-to-metal contact, overheating and rapid failure of the bearing. 例如：如果止推轴承上的作用力过大的话，会挤出油膜，引起金属和金属之间的相互接触，轴承将过热而迅速失效。 Our intuitive concept of force includes such ideas as place of application, direction, and magnitude, a
3、nd these are called the characteristics of a force. 力的直观概念包括力的作用点、大小、方向，这些被称为力的三要素。 All bodies are either elastic or plastic and will be deformed if acted upon by forces. When the deformation of such bodies is small, they are frequently assumed to be rigid, i.e., incapabl
4、e of deformation, in order to simplify the analysis. 所有的物体既可以是弹性的也可以是塑性的，如果受到力的作用就产生变形。当变形很小的时候它们被假设成刚体，也就是不产生变形,以此来简化分析。 The rigid-body assumption cannot be used in internal stresses and strains due to the applied forces to be analyzed. Thus we consider the body to be ca
5、pable of deforming. 刚体假设不能应用于内应力和内应变的分析，所以在实际力的分析时，要考虑物体的形变。 If all the forces acting on a particle are balanced, the particle will either remain at rest or will continue to move in a straight line at a uniform velocity. 如果作用在质点上所有的力是平衡的，质点将会保持静止或做做匀速直线运动。 第二单元 材料的强度与塑性
6、 A tensile test consists of slowly pulling a sample of material with a tensile load until it breaks. The ends of tensile specimens are usually enlarged to provide extra area for grip-ping and to avoid having the sample break where it is being gripped. 拉伸试验包括慢慢加载拉伸载荷直到断裂。拉
7、伸试件两端加粗为了提供装夹区域和避免试件断裂。 The usual manner of conducting the test is to deform the specimen at a constant speed. For example, in the universal testing machines, the motion between the fixed and moving crossheads can be controlled at a constant speed. 通常进行试验的方法就是使试件以恒定速度发生变
8、形。例如，在万能拉伸试验机上，固定端和移动的十字滑块之间的变形是以恒定速度进行的。 The load that must be applied to enforce this displace
