工程材料与热加工(一)习题答案第1章(最新整理)

1、一、填空题第 1 章习题参考答案自测题21. 强度、刚度、硬度、塑性、韧性2. esb3. 屈服点规定残余伸长率为 0.2%时的应力值塑性变形4. 断后伸长率断面收缩率断面收缩率5. 应力场强度因子断裂韧度断裂二、判断题1.（）2.（）3.（）4.（）习题与思考题1.5因为 = l1 - l0 100% = l1 - 5d0 100% =25%l05d0l10 = l1 - l0 100% = l1 - 10d0 100% =25%010d0所以 l1（5）=6.25d0 同理 l1（10）=12.5d0长试样的塑性好。设长试样为 a,短试样为 b,已知 5b=10a，因为同一种材料，510，

2、 所以 5b=10a5a,则 5b225 mpab= fbs0=345003.14 25= 439.5 mpa 372mpa5 = l1 - 5d0 100% = 65 - 500100% = 30% 27%5d0s - s5052 - 322= 01 100% =s03= 64% 55%所以，该 15 钢合格3.（1）洛氏硬度 hrc；（2）洛氏硬度 hrb；（3）洛氏硬度 hra；（4）布氏硬度hb；（5）维氏硬度 hv。4.据公式： ki = ys a2kic170228900s压力容器钢：a= y 2s 2= 3.14 10002 = 3140000 =0.0092038m2kic25

3、2625s铝合金：a= y 2s 2= 3.14 4002=0.001244m502400压力容器钢更适合作压力容器。“”“”at the end, xiao bian gives you a passage. minand once said, people who learn to learn are very happy people. in every wonderful life, learning is an eternal theme. as a professional clerical and teaching position, i understand the impor

4、tance of continuous learning, life is diligent, nothing can be gained, only continuous learning can achieve better self. only by constantly learning and mastering the latest relevant knowledge, can employees from all walks of life keep up with the pace of enterprise development and innovate to meet the needs of the market. this document is also edited by my studio professionals, there may be err