SHEAR 2) Characteristics of loads and deformation: Use a rivet as an example Characteristic of loads (Resultant The rivet is subjected to two equal and P opposite forces. The acting lines of these n two forces are very close (Resultant 2 Characteristic of deformation Two parts subjected to two equal and opposite forces tend to shift over one another along the junction plane of two forces
2)Characteristics of loads and deformation： n n （Resultant） （Resultant） P P Use a rivet as an example： ① Characteristic of loads： The rivet is subjected to two equal and opposite forces. The acting lines of these two forces are very close. ② Characteristic of deformation: Two parts subjected to two equal and opposite forces tend to shift over one another along the junction plane of two forces
2、受力特点和变形特点: 以铆钉为例 ①受力特点: 合力 构件受两组大小相等、方向相 P 反、作用线相距很近(差一个几 一n何平面)的平行力系作用。 1(合力) ②变形特点: 构件沿两组平行力系的交界面 发生相对错动
2、受力特点和变形特点： n n （合力） （合力） P P 以铆钉为例： ①受力特点： 构件受两组大小相等、方向相 反、作用线相距很近（差一个几 何平面）的平行力系作用。 ②变形特点： 构件沿两组平行力系的交界面 发生相对错动
SHEAR Resultant ③ Shearing plane: The plane along which two parts of the n n member tend to shift over one another Such P as n-n Resultant (Internal force on shearing plane Internal force- Shearing force @, its Shearing acting line is parallel to the shearing plane Q plane n n
n n （ Resultant ） （Resultant P P ③Shearing plane： The plane along which two parts of the member tend to shift over one another. Such as n– n . ④Internal force on shearing plane： Internal force — Shearing force Q ，its acting line is parallel to the shearing plane. P n n Q Shearing plane
(合力 ③剪切面: 构件将发生相互的错动面,如 n n n-no P (合力) ④剪切面上的内力: 内力一剪力Q,其作用线与 剪切面剪切面平行。 Q n n
n n （合力） （合力） P P ③剪切面： 构件将发生相互的错动面，如 n– n 。 ④剪切面上的内力： 内力 — 剪力Q ，其作用线与 剪切面平行。 P n n Q 剪切面
SHEAR (Resultant 3)Three kinds of breakage at joint: ① Failure due to shear n n g the shearing plane of the rivet Snip ald P such as along section n-n. Resultant @Breakage due to bearing Fail due to mutual bearing between the Shearing O n plane rivet and the steel plate in their connecting plane n Breakage due to tension P The steel plate is weakened in the section in which the rivet holes exist and stress in the weakened section increases so that the steel plate is easily broken due to tension at the connecting position
n n (Resultant ) (Resultant ） P P 3)Three kinds of breakage at joint： ①Failure due to shear Snip along the shearing plane of the rivet, such as along section n– n. ②Breakage due to bearing Fail due to mutual bearing between the rivet and the steel plate in their connecting plane. ③Breakage due to tension P n n Q Shearing plane The steel plate is weakened in the section in which the rivet holes exist and stress in the weakened section increases so that the steel plate is easily broken due to tension at the connecting position