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材料力学性能检验员试题!

材料力学性能检验员试题!

一、填空题(20题,核心考点)

1. 金属材料五大力学性能:强度、塑性、硬度、韧性、疲劳强度。

2. 拉伸试验中,材料开始塑性变形的应力叫屈服强度,符号ReL。

3. 布氏硬度(HBW)常用压头:硬质合金球,结果与压痕直径平方成反比。

4. 洛氏硬度HRC压头:120°金刚石圆锥,适用于淬火钢、硬质合金。

5. 冲击韧性用夏比冲击试验测定,V型缺口比U型更尖锐、应力集中大。

6. 疲劳破坏特点:应力低于屈服强度,无明显塑性变形,突发断裂。

7. 断后伸长率A=(L₁-L₀)/L₀×100%,L₀原始标距,L₁断后标距。

8. 弹性模量E越大,材料刚性越强、弹性变形越小。

9. 泊松比ν:横向应变/纵向应变,金属一般0.25~0.35。

10. 硬度:材料抵抗**局部塑性变形(压痕/划痕)**的能力。

11. 拉伸试验三阶段:弹性变形、塑性变形、断裂。

12. 规定非比例延伸强度Rp0.2:**残余塑性变形0.2%**对应的应力。

13. 冲击吸收功Ak:试样断裂时吸收的能量,值越大韧性越好。

14. 低温脆性:温度降低,韧性下降、脆性上升,易脆断。

15. 布氏硬度试验,相邻压痕距≥5倍压痕直径。

16. 洛氏硬度HRB压头:φ1.588mm钢球,适用于黄铜、退火钢。

17. 疲劳极限:交变载荷下无数次循环不断裂的最大应力。

18. 压缩试验,长细比小试样失效:屈服;长细比大:失稳。

19. 材料塑性指标:断后伸长率、断面收缩率。

20. 硬度试验前,试样表面需打磨抛光、去氧化皮油污。

二、判断题(20题,对√错×)

1. 布氏硬度值越大,材料越软。(×)

2. 抗拉强度是材料断裂前最大应力,选材重要依据。(√)

3. 伸长率越大,塑性越好。(√)

4. 弹性模量越大,刚性越弱。(×)

5. 硬度与强度无关联。(×)

6. 韧性材料断裂前塑性变形大,脆性材料反之。(√)

7. 力学性能不随温度变化。(×)

8. 泊松比恒为正值。(×)

9. 屈服强度低于抗拉强度。(√)

10. 冲击缺口越深越尖,冲击韧性值越大。(×)

11. 疲劳破坏有明显塑性变形。(×)

12. HRC适合测软金属。(×)

13. 拉伸试验标距段应变含弹性+塑性。(√)

14. 布氏硬度压痕小,适合测薄件。(×)

15. 冲击试验机需在计量有效期内使用。(√)

16. 断面收缩率越大,塑性越好。(√)

17. 蠕变是高温下恒定应力的缓慢塑性变形。(√)

18. 硬度试验可在粗糙表面直接测。(×)

19. 同种材料,V型缺口冲击功比U型小。(√)

20. 拉伸试样断裂位置在标距外,结果无效。(√)

三、选择题(20题,单选)

1. 测屈服强度、抗拉强度的试验是(A)

A.拉伸试验 B.冲击试验 C.弯曲试验 D.扭转试验

2. HRC压头是(B)

A.硬质合金球 B.120°金刚石圆锥 C.钢球 D.金刚石四棱锥

3. 布氏硬度HBW与(A)成反比

A.压痕直径平方 B.压痕直径 C.压痕深度 D.压痕深度平方

4. 适合HRB的材料是(B)

A.淬火钢 B.黄铜 C.硬质合金 D.玻璃

5. 相邻压痕距≥压痕直径的(D)倍

A.2 B.3 C.4 D.5

6. 塑性指标是(C)

A.硬度 B.屈服强度 C.伸长率 D.冲击功

7. 弹性模量E的单位是(C)

A.N B.Pa C.MPa D.无量纲

8. 低温韧性用(A)试验

A.夏比V型冲击 B.洛氏硬度 C.拉伸 D.布氏硬度

9. 疲劳极限是(A)下的最大应力

A.循环应力 B.静态应力 C.短时应力 D.长时应力

10. 规定非比例延伸强度是(B)

A.ReL B.Rp0.2 C.Rm D.Ak

11. 脆性材料特征是(C)

A.断裂前变形大 B.冲击功高 C.断裂前变形小 D.伸长率大

12. 45钢淬火后性能是(B)

A.硬度低塑性高 B.硬度高塑性低 C.都适中 D.都低

13. 泊松比是(A)比值

A.横向/纵向应变 B.纵向/横向应变 C.横向/纵向应力 D.纵向/横向应力

14. 冲击吸收功越大,材料(B)

A.越脆 B.韧性越好 C.硬度越高 D.强度越高

15. 拉伸试验中Rm是(C)

A.屈服强度 B.弹性极限 C.抗拉强度 D.疲劳极限

16. 布氏硬度压头直径是(D)

A.1.588mm B.2.5mm C.5mm D.10mm

17. 影响疲劳极限的因素不包括(D)

A.化学成分 B.表面质量 C.温度 D.颜色

18. 压缩试验长细比大试样失效(B)

A.屈服 B.失稳 C.断裂 D.硬化

19. 硬度试验表面处理目的(A)

A.去氧化皮油污 B.防生锈 C.提高塑性 D.降低硬度

20. 拉伸试样原始标距L₀=5d,d是(A)

A.试样直径 B.标距长度 C.断后直径 D.半径

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  1. CONNECT:[ UseTime:0.000969s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000852s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000295s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000277s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000462s ]
  6. SELECT * FROM `set` [ RunTime:0.000186s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000564s ]
  8. SELECT * FROM `article` WHERE `id` = 900863 LIMIT 1 [ RunTime:0.000383s ]
  9. UPDATE `article` SET `lasttime` = 1786093356 WHERE `id` = 900863 [ RunTime:0.003288s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000265s ]
  11. SELECT * FROM `article` WHERE `id` < 900863 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000408s ]
  12. SELECT * FROM `article` WHERE `id` > 900863 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000391s ]
  13. SELECT * FROM `article` WHERE `id` < 900863 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001197s ]
  14. SELECT * FROM `article` WHERE `id` < 900863 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005495s ]
  15. SELECT * FROM `article` WHERE `id` < 900863 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001298s ]
0.195462s