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材料力学 本书特色
《材料力学》是普通高等教育“十一五”国家级规划教材,高等学校双语教学课程教材之一。
材料力学 目录
材料力学 节选
《材料力学》是“十一五”国家级规划教材。内容有轴向拉伸与压缩,剪切与挤压,扭转,弯曲内力,弯曲应力,弯曲变形,应力应变变换与强度理论,组合变形,能量法,压杆稳定;在附录中有截面图形几何性质及型钢表。书中的例题较多,形式新颖;英语表述流畅。《材料力学》主要作高等学校材料力学双语教学的教科书,也可作研究生及工程技术人员的参考书。
材料力学 相关资料
插图:1.1 THE TASK OF MECHANICS OF MATERIALSIn engineering practice, we are always dealing with structures. There are many examples of structures such as buildings, bridges, airplanes, boats, vehicles, trains and all kinds of machines. Structures are quite different in type, but they have a common character that all structures bear loads. For example, buildings bear wind toad, seismic load, and load from residents. Bridges carry wind load, earthquake load and the load from vehicles. Vehicles carry the load from tourists, etc. Structures consist of several main portions called members such as rods, beams, columns, plates, shells, shafts, bolts, wheels etc. In civil engineering, these members are called structural components, while in mechanical engineering, they are called component parts.MeChanics of materials studies members. Let us see what kind of requirements they should meet when members are working. First of all, they can not be broken otherwise the structures including these members will collapse. Bridges can not be damaged when vehicles are running on them. When a lathe is processing parts, its shafts can not be broken. If such things happen, disastrous consequences will occur. In other words, members have to have enough strength to bear the loads safely. Second, deformation or deflection of members should be limited within some allowable ranges. For example, the deflection of a crane beam should not be too large otherwise the card on the beam will be driven with difficulty. If the principal shaft of a lathe has large deformation, the accuracy of the parts being processed will not be guaranteed. That is, the members should have enough stiffness to resist deformation.The third, members have to have stability. Right now, we are not able to give the definition of stability, but we can give an example. We take a slender column with a compressive force exerted on top of it. If the force is sufficiently large, the column will bend. That is, the equilibrium state of the column with a straight-line shape becomes unstable, or the column loses its stability. Stability is also an important requirement for members. If a column of a building loses its stability, the building will collapse, the consequence is also catastrophic.
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