§3-1 扭转的概念和实例 (Concepts and example problem of torsion) §3-2 扭转内力的计算 (Calculating internal force of torsion) §3-3 薄壁圆筒的扭转 (Torsion in thin—wall circular tube) §3-4 圆轴扭转的应力分析及强度条件 (Analyzing stress of circular bars & strength condition) §3-8 开口和闭合薄壁截面杆的自由扭转 (Free torsion of open and closed thinwalled members) §3-5 圆杆在扭转时的变形 ·刚度条件 (Torsional deformation of circular bars & stiffness condition) §3-6 密圈螺旋弹簧的应力和变形 (Calculation of the stress and deformation in close-coiled helical springs) §3-7 非圆截面杆的扭转 (Torsion of noncircular prismatic bars)
§13-1 概述(Introduction) §13-2 杆件变形能的计算( Calculation of strain energy for various types of loading ) §13-3 互等定理(Reciprocal theorems) §13-4 单位荷载法 • 莫尔定理(Unit-load method & mohr’s theorem) §13-5 卡氏定理(Castigliano’s Theorem) §13-6 计算莫尔积分的图乘法 (The method of moment areas for mohr’s integration)
1. frustrate [ frQs5treit ] 1)阻止(某人)做某 事;破坏(to prevent from achieving an objective) 2) 使沮丧(to cause feelings of discouragement ) The weather frustrated our plans. 天气破坏了我们的计划。 two hour's frustrating delay
1. toil [ tCil ]苦干, 跋涉, 费力地做 (to do work that requires a lot of effort) [搭配用法] toil over (task, manuscript, corrections) = work hard and continuously at sth 例 toiling over the mountains. 艰难地跋涉于山岭之间
1. abandon [ E5bAndEn ] 1)放弃, 遗弃(to give up completely)2)n.放任, 狂热 [搭配用法](writer, artist)abandon oneself to (grief, despair)=give way to ◼ He abandoned his wife and went away with all their money