材力小结
1.Three requirements for members are strengt , stiffness and stability.
2.Three basic assumption for deformable solid are continuity assumption, homogenization assumption(均匀性假设) and isotropy assumption(连续性假设).
3.Materials are assumed to be continuous, homogeneous , isotropic, linearly elastic (线性弹性)and small deformation.
4.Stress means force per unit area.
5.Stresses are classified into normal stresses and shear stresses
6.For normal stresses: positive in tension and negative in compression
7.For shear stresses: positive in clockwise direction and negative in counterclockwise direction.
8.Stresses have a unit of Pa, kPa, or MPa.
9.Stress and strain curve can be obtained from laboratory testing.
10.Stress and strain curve has four stages: elastic stage ,yielding stage, strengthing stage and stage of local deformation(局部变形阶段) .
11.From stress and strain curve, we get Young’s modulus(modulus of elasticity), elastic limit(弹性极限), yielding strength (屈服极限)and ultimate strength(强度极限).
12.According to the permanent deformation before failure, materials can be classified as ductile materials(塑性材料) and brittle materials(脆性材料).
13.Hooke’s law in simply tension states that the longitudinal stress is linearly proportional to the longitudinal strain
14.Hooke’s law in pure shear states that the shear stress is linearly proportional to the shear strain.
15.Modulus of elasticity or Young’s modulus
16.Shear modulus(切变模量) of elasticity or modulus of rigidity can be derived from modulus of elasticity and Poisson's ratio.
17.Poisson's ratio is defined as the absolute value of the lateral strain(横向线应变) over axial strain(纵向线应变).
18.Poisson's ratio ranges from 0 to 0.5 generally.
19.Shear strain(切应变) is an angle change produced by the shear stresses(切应力).
20.Normal strain is the elongation per unit length.
21.Internal force is acting on a certain cross section.
22.Internal force can be solved from external forces with the help of free-body diagram.
23.Internal force is usually displayed in a diagram.
24.Internal force diagram shows clearly the distribution of the internal force, which helps us to locate the critical cross section(危险截面) and calculate the maximum stress.
25.Stresses on the inclined cross section changes with the normal direction of the cross section.
26.Maximum normal stresses occur when shear stresses become zero.
27.Maximum shear stresses occur when normal stresses become average.
28.The strain energy stored in a member is equal to the work done by the external force acting on the same member.
29.The strain energy is expressed in the form of strain and stress.
30.Statically equivalent forces produce big difference of stress state in the nearby region of forces, little
difference of stress state in the region far from the action of the forces.
31.Statically equivalent forces mean that two systems of forces have the same resultant force and same resultant moment.
32.Parallel planes in the member keep parallel after deformation.
33.Each point on the plane has the same elongation or contraction(收缩).
34.Thus ,the strain on the plane is a constant.
35.Planes in the shafts rotates(旋转) with each other.
36.The distance of planes remain unchanged.
37.The shear strain is dependent on the angle of twist per unit length and linearly proportional to the distance from the center.
38.The determination of a factor of safety must take into account the matters as the following:
39.1]Imperfect manufacture(非完美产品) 2]Uncertainty of loading(不确定荷载)
40.3]Approximate theory 4]Testing methods
41.5]Consequence of failure(minor damage or major catastrophe) 6]Environmental effects
42.7]Economic consideration and so on.
43.Beam 梁
44.Simply supported beam 简支梁
45.Roller support of pin joint 可动铰支座 Fixed suppert of pin joint 固定铰支座
46.Cantilever <?kæntili?v?>beam 悬臂梁 Fixed end 固支端
47.Bending moment diagram 弯矩图
48.Shearing force diagram 剪力图
49.Uniformly distributed force 均布力
50.differential equation of the deflection curve 挠曲线微分方程
51.bending moment equation 弯矩方程
52.shear force equation 剪力方程
53.load equation 荷载方程
54.boundary condition 边界条件
55.continuity condition 连续条件(连接条件)
56.symmetry condition 对称条件
57.Statically determinate problems (静定问题) are problems in which the reaction forces can be determined by the equilibrium equations only.
58.Statically indeterminate problems (静不定问题) are problems in which the reaction forces can not be determined without the introduction of the coordinate relations.
59.Measures for reducing the bending stresses are 1) increasing the moment of inertia of a cross section, 2) adjustment of the supports and load, 3) rational design of cross section.
60.What is the difference between the strength condition or criterion and the stiffness condition or criterion?
61.What is the plane hypothesis for the pure bending?
62.What is the limitation of the normal stress and shear stress formula for a beam?
63.How many steps are involved in the method of successive integration?
64.What does the principles of superposition for the deflection of a beam state?
65.What is neutral axis of a beam, how to determine it?
66.How is the shear stress distributed on the cross section of a beam?
67.How is the normal stress distributed on the cross section of a beam?
68.Is the normal strain distribution on the cross section dependent on the materials of a beam?
69.Find the deflection at the end of the cantilever beam supported by a spring at the middle of the beam as shown in figure 1. The rigidity of the beam is EI.
70.Find the neutral axis of a beam made of two materials E1 / E2=3, as shown in figure 2.
71.What is the application of shear force diagram and moment diagram?
72.What is the difference between the strength condition or criterion and the stiffness condition or criterion?
73. Stress state 应力状态
74. Mohr‘s circle for stress 应力莫尔圆
75. Principal stress 主应力
76. Maximum shear stress 最大剪应力
77. Octagonal shear stress 八面体剪应力
78.Statically determinate problems (静定问题)
79. are problems in which the reaction forces can be determined by the equilibrium equations only.
80.Statically indeterminate problems (静不定问题) are problems in which the reaction forces can not be determined without the introduction of the coordinate relations.
81.In three dimensional problems, there exist 6 independent stress components, they are __ __ __ __ __ and __ respectively.
82.
83.In two dimensional problems, there exist 3 independent stress components, they are
84. ___ ___ and ___ respectively.
85.The four classical strength theories include maximum tensile stress theory maximum elongated normal strain theory maximum shear stress theory and maximum distortional strain energy theory. The first and second are mainly for brittle materials; the third and fourth are mainly for ductile materials.
86.How to construct the Mohr's circle for stress?
87.What can we get from the Mohr's circle for stress?
88.Make a brief comparison between the four strength theories
89.组合变形及连接部分的计算 combined deformation analysis of connections
90.连接件 connecting elements 键key 螺栓bolt 铆钉rivet
91.工程实用计算方法 engineering method of practical analysis
92.交变应力 alternating stress
93.挤压力 bearing force
94.计算挤压面积 effective bearing surface
95.总应力 overall stress
96.榫接 mortise joint 榫头 Tenon 榫眼mortise
97.榫接 joggle connection
98.焊接 welded joint
99.Find the deflection at the end of the cantilever beam supported by a spring at the middle of the beam as shown in figure 1. The rigidity of the beam is EI.
100.Find the neutral axis of a beam made of two materials E1 / E2=3, as shown in figure 2.
101.What is the plane hypothesis for the pure bending?
102.What is the limitation of the normal stress and shear stress formula for a beam?
103.How to plot shear force diagram and moment diagram?
104.What are static moment and moment of inertia of cross sectional area used for ?
内容需要下载文档才能查看
下载文档
热门试卷
- 2016年四川省内江市中考化学试卷
- 广西钦州市高新区2017届高三11月月考政治试卷
- 浙江省湖州市2016-2017学年高一上学期期中考试政治试卷
- 浙江省湖州市2016-2017学年高二上学期期中考试政治试卷
- 辽宁省铁岭市协作体2017届高三上学期第三次联考政治试卷
- 广西钦州市钦州港区2016-2017学年高二11月月考政治试卷
- 广西钦州市钦州港区2017届高三11月月考政治试卷
- 广西钦州市钦州港区2016-2017学年高一11月月考政治试卷
- 广西钦州市高新区2016-2017学年高二11月月考政治试卷
- 广西钦州市高新区2016-2017学年高一11月月考政治试卷
- 山东省滨州市三校2017届第一学期阶段测试初三英语试题
- 四川省成都七中2017届高三一诊模拟考试文科综合试卷
- 2017届普通高等学校招生全国统一考试模拟试题(附答案)
- 重庆市永川中学高2017级上期12月月考语文试题
- 江西宜春三中2017届高三第一学期第二次月考文科综合试题
- 内蒙古赤峰二中2017届高三上学期第三次月考英语试题
- 2017年六年级(上)数学期末考试卷
- 2017人教版小学英语三年级上期末笔试题
- 江苏省常州西藏民族中学2016-2017学年九年级思想品德第一学期第二次阶段测试试卷
- 重庆市九龙坡区七校2016-2017学年上期八年级素质测查(二)语文学科试题卷
- 江苏省无锡市钱桥中学2016年12月八年级语文阶段性测试卷
- 江苏省无锡市钱桥中学2016-2017学年七年级英语12月阶段检测试卷
- 山东省邹城市第八中学2016-2017学年八年级12月物理第4章试题(无答案)
- 【人教版】河北省2015-2016学年度九年级上期末语文试题卷(附答案)
- 四川省简阳市阳安中学2016年12月高二月考英语试卷
- 四川省成都龙泉中学高三上学期2016年12月月考试题文科综合能力测试
- 安徽省滁州中学2016—2017学年度第一学期12月月考高三英语试卷
- 山东省武城县第二中学2016.12高一年级上学期第二次月考历史试题(必修一第四、五单元)
- 福建省四地六校联考2016-2017学年上学期第三次月考高三化学试卷
- 甘肃省武威第二十三中学2016—2017学年度八年级第一学期12月月考生物试卷
网友关注
- 2004年甘肃省天水公务员面试真题及解析
- 2009年甘肃省公务员考试《行测》真题
- 2007年甘肃省公务员考试《申论》真题
- 2019湖北公务员申论模拟题:环保督查“回头看”
- 2019湖北公务员行测资料分析模拟题07.25
- 2019湖北公务员行测数量关系模拟题07.02
- 2008年甘肃省兰州市公务员面试真题
- 2019湖北公务员申论模拟题:“老漂族”的烦恼
- 2010年甘肃省平凉公务员面试真题(2011年1月23日)
- 2010年甘肃省嘉峪关公务员面试真题(2011年1月23日)
- 2019湖北公务员行测资料分析模拟题答案07.04
- 2010年甘肃省白银公务员面试真题(2011年1月23日)
- 2019湖北公务员行测言语理解模拟题07.19
- 2009年甘肃省公务员考试《申论》真题参考答案
- 2019湖北公务员申论模拟题:互联网状态下,我们还需要科普吗
- 2006年甘肃省酒泉公务员面试真题
- 2019湖北公务员行测言语理解模拟题答案07.12
- 2019湖北公务员行测资料分析模拟题答案07.25
- 2007年甘肃省公务员考试《申论》真题参考答案
- 2019湖北公务员行测言语理解模拟题答案07.05
- 2019湖北公务员申论模拟题:谈谈对“立鸿鹄志,做奋斗者”的理解
- 2019湖北公务员行测言语理解模拟题07.12
- 2019湖北公务员行测资料分析模拟题07.04
- 2019湖北公务员行测言语理解模拟题答案06.28
- 2009年甘肃省公务员考试《行测》真题参考答案
- 2019湖北公务员考试申论模拟题:预防残疾
- 2010年甘肃省兰州公务员面试真题(2011年1月23日)
- 2019湖北公务员行测言语理解模拟题07.05
- 2005年9月甘肃省张掖公务员面试真题
- 2019湖北公务员行测常识判断模拟题答案07.06
网友关注视频
- 化学九年级下册全册同步 人教版 第22集 酸和碱的中和反应(一)
- 北师大版数学四年级下册3.4包装
- 小学英语单词
- 《空中课堂》二年级下册 数学第一单元第1课时
- 8.练习八_第一课时(特等奖)(苏教版三年级上册)_T142692
- 第12章 圆锥曲线_12.7 抛物线的标准方程_第一课时(特等奖)(沪教版高二下册)_T274713
- 七年级英语下册 上海牛津版 Unit9
- 【部编】人教版语文七年级下册《逢入京使》优质课教学视频+PPT课件+教案,安徽省
- 苏科版八年级数学下册7.2《统计图的选用》
- 外研版英语七年级下册module3 unit2第一课时
- 沪教版牛津小学英语(深圳用) 四年级下册 Unit 12
- 第19课 我喜欢的鸟_第一课时(二等奖)(人美杨永善版二年级下册)_T644386
- 冀教版英语三年级下册第二课
- 苏科版数学七年级下册7.2《探索平行线的性质》
- 沪教版八年级下册数学练习册21.4(1)无理方程P18
- 【部编】人教版语文七年级下册《过松源晨炊漆公店(其五)》优质课教学视频+PPT课件+教案,辽宁省
- 3月2日小学二年级数学下册(数一数)
- 冀教版小学数学二年级下册1
- 沪教版牛津小学英语(深圳用)五年级下册 Unit 1
- 第五单元 民族艺术的瑰宝_16. 形形色色的民族乐器_第一课时(岭南版六年级上册)_T3751175
- 苏教版二年级下册数学《认识东、南、西、北》
- 【部编】人教版语文七年级下册《逢入京使》优质课教学视频+PPT课件+教案,安徽省
- 【部编】人教版语文七年级下册《过松源晨炊漆公店(其五)》优质课教学视频+PPT课件+教案,江苏省
- 【部编】人教版语文七年级下册《泊秦淮》优质课教学视频+PPT课件+教案,广东省
- 人教版二年级下册数学
- 七年级英语下册 上海牛津版 Unit3
- 冀教版小学数学二年级下册第二周第2课时《我们的测量》宝丰街小学庞志荣.mp4
- 人教版历史八年级下册第一课《中华人民共和国成立》
- 30.3 由不共线三点的坐标确定二次函数_第一课时(市一等奖)(冀教版九年级下册)_T144342
- 第4章 幂函数、指数函数和对数函数(下)_六 指数方程和对数方程_4.7 简单的指数方程_第一课时(沪教版高一下册)_T1566237
精品推荐
- 2016-2017学年高一语文人教版必修一+模块学业水平检测试题(含答案)
- 广西钦州市高新区2017届高三11月月考政治试卷
- 浙江省湖州市2016-2017学年高一上学期期中考试政治试卷
- 浙江省湖州市2016-2017学年高二上学期期中考试政治试卷
- 辽宁省铁岭市协作体2017届高三上学期第三次联考政治试卷
- 广西钦州市钦州港区2016-2017学年高二11月月考政治试卷
- 广西钦州市钦州港区2017届高三11月月考政治试卷
- 广西钦州市钦州港区2016-2017学年高一11月月考政治试卷
- 广西钦州市高新区2016-2017学年高二11月月考政治试卷
- 广西钦州市高新区2016-2017学年高一11月月考政治试卷
分类导航
- 互联网
- 电脑基础知识
- 计算机软件及应用
- 计算机硬件及网络
- 计算机应用/办公自动化
- .NET
- 数据结构与算法
- Java
- SEO
- C/C++资料
- linux/Unix相关
- 手机开发
- UML理论/建模
- 并行计算/云计算
- 嵌入式开发
- windows相关
- 软件工程
- 管理信息系统
- 开发文档
- 图形图像
- 网络与通信
- 网络信息安全
- 电子支付
- Labview
- matlab
- 网络资源
- Python
- Delphi/Perl
- 评测
- Flash/Flex
- CSS/Script
- 计算机原理
- PHP资料
- 数据挖掘与模式识别
- Web服务
- 数据库
- Visual Basic
- 电子商务
- 服务器
- 搜索引擎优化
- 存储
- 架构
- 行业软件
- 人工智能
- 计算机辅助设计
- 多媒体
- 软件测试
- 计算机硬件与维护
- 网站策划/UE
- 网页设计/UI
- 网吧管理