典型习题解析 1作图示简支梁的剪力图和弯矩图,并求出Fm和Mm

1已知矩形截面梁,某截面上的剪力Fs=120kN及弯矩M=10kNm绘出表示1

1图示№20a工字钢,在温度20℃时安装,这时杆不受力,试问:当温度升高多少度时,工 字钢将丧失稳定?钢的线膨胀系数a=12.5×10-61/℃ 解题分析:计算时,取i的最小值。此题是 一度静不定问题,利用变形协调方程求解

1一圆杆横截面面积为A,弹性模量为E杆下端带一法兰盘,杆上部套一圆形重物,如 图所示。设重物P离法兰盘高为h,当重物自由落下时,形成冲击载荷作用在杆上。试计算 杆中动应力

3.064 Quiz 3- Sample Questions 1. Consider a unidirectionally reinforced fiber-matrix composite a)What elastic constants(relative to the fiber and transverse directions )are needed to describe this material?

uiz2(11/7/03)-sar esti。ns rse and fiber-directi moduli for a transversely isotropic composite lamina 2. Plot and explain the variation of fiber-direction strength of a unidirectionally-reinforced lamina as a function of fib fraction

3.064Quiz10/10/03 Sample questions 1. What is the glass transition temperature of a polymer How can it be measured? What molecular characteristics determine its value Illustrate by giving the chemical structure and Tg for polyethylene polyvinyl chloride and polystyrene

麻省理工学院：《polymer engineering》p7 6

麻省理工学院：《polymer engineering》p7-5

麻省理工学院：《polymer engineering》p7-15