文档介绍：CHAPTER 16 FURTHER RESEARCH ON MECHANICAL
Mechanics of Materials
材料力学
第十六章
CHAPTER16 FURTHER RESEARCH ON MECHANICAL PROPERTIES OF MATERIALS
§16–1 SUMMARY
§16–2 EFFECTS OF THE STRAIN RATE AND STRESS RATE ON MECHANICAL PROPERTIES OF MATERIALS
§16–3 EFFECTS OF TEMPERATURE ON MECHANICAL PROPERTIES OF MATERIALS
§16–4 EFFECTS OF TEMPERATURE AND TIME ON MECHANICAL PROPERTIES OF MATERIALS ·CREEP AND RELAXATION
§16–5 MECHANICAL PROPERTIES OF MATERIALS UNDER IMPACT LOADS · IMPACT TOUGHNESS · TRANSITON TEMPERATURE
第十六章材料力学性能的进一步研究
§16–1 概述
§16–2 应变速率及应力速率对材料力学性能的影响
§16–3 温度对材料力学性能的影响
§16–4 温度与时间对材料力学性能的影响· 蠕变与松弛
§16–5 冲击荷载下材料的力学性能·冲击韧度·转变温度
§16–1 SUMMARY
The mechanical properties of materials at high temperature, in static loading(by quasi-static test), tension pression are introduced in the above chapter 1. Real structures or members usually work plex conditions. For example, the working temperature of some petroleum chemical equipments is very slow, and the working temperature of some bustion engines or gas turbines is very high; the blades of the steam turbines are always subjected to large centrifugal forces; the prestressed steel bars or wires in the prestressed steel-bar reinforced concrete always work under high pre-tensile stresses at normal temperatures for periods of long time; the bridge beams, crane beams and most motive machines are often subjected to the loads varying alternately with time; the wind-driven machinery pneumatic hammers and conventional weapons are often subjected to impact loads repeatly and etc. So the effects of these factors on mechanical properties of materials are needed to be considered in the strength calculation.
FURTHER RESEARCH ON MECHANICAL PROPERTIES OF MATERIALS
材料力学性能的进一步分析
§16–1 概述
前面第一章中介绍了材料在高温、静载(用准静态试验)拉伸、压缩时的力学性能。实际的结构物或构件往往是在比较复杂的条件下工作的,例如,石油化工设备中有些机器的工作温度很低,而内燃机或燃气轮机的工作温度很高;汽轮机的叶片在高温下长期受很大的离心力作用;预应力钢筋混凝土中的预应力钢筋或钢丝束则在常温下长期在很高的预拉应力下工作;桥梁、吊车梁以及绝大多数的动力机械所受荷载多是随时间交替变化的;风动机械、气锤、常规武器则经常受到冲击载荷的反复作用,等等。因此在强度计算时常需考虑这些因素对