机械制造专业英语 课后答案(部分)讲解.doc

专业英语翻译 一stress and 1the fundamental concepts 基本概念 cross section 横截面 the internal stresses produced in the bar 杆的内应力 continuous distribution of hydrostatic pressure 流体静压力 the tensile load 拉伸载荷 a uniform dis tribution over the cross section 在横截面均匀分布 arbitrary cross-sectional shape 任意截面形状 tensile stresses 拉应力 compressive stresses 压应力 a normal stress 正应力 through the centroid of the cross sectional area 通过横截面形心 the uniform stress condition 压力均匀分布 the stress distribution at the ends of the bar 杆末端应力分布 high localized stresses 高度应力集中 an axially loaded bar 轴向载荷杆件 a tensile strain 拉应变 an elongation or stretching of the material 材料拉伸 a compressive strain 压应变 the ratio of two lengths 两个长度的比值 purely statical and geometrical considerations 从纯静态以及几何角度考虑 1.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支， 被称作力学， 力学由两大部分组成， 静力学和动力学。 2.For example, if the force operating on a sleeve bearing becomes too high, 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。 3.Our intuitive concept of force includes such ideas as place of application, direction, and magnitude, and 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。 4.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., incapable 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。 5.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 capable 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。 6.If all the forces acting on a particle are balanced, the particle will either remain at rest or will con