Shearing and Bearing Stressmi@seeo.cn
Shearing and Bearing Stress mi@seu.edu.cn
Contents·Introduction to Pin Shearing and Bearing（连接件中的剪切和挤压简介）·Shearing Stress（剪切应力）·Bearing Stress（挤压应力）·StressAnalysis&DesignExample（应力分析与设计示例)vRod&BoomNormal Stresses（杆件拉压正应力）vPin Shearing Stresses（销钉剪切应力）vPinBearingStresses（销钉挤压应力）·More Examples（更多示例）2
Contents • Introduction to Pin Shearing and Bearing（连接件中的 剪切和挤压简介） • Shearing Stress（剪切应力） • Bearing Stress（挤压应力） • Stress Analysis & Design Example（应力分析与设计示 例） Rod & Boom Normal Stresses（杆件拉压正应力） Pin Shearing Stresses（销钉剪切应力） Pin Bearing Stresses（销钉挤压应力） • More Examples（更多示例） 2
Introduction to Pin Shearing and BearingLoadLoadFailure of a boltin single shear3
Failure of a bolt in single shear Introduction to Pin Shearing and Bearing 3
Shearing Stress1. Forces P and P'are applied transversely to themember AB.BA: Corresponding internal forces act in the planeof section C and are called shearing forcesTheresultantoftheinternal shearforcedistribution is defined as the shear of the sectionand is equal to the load P.The corresponding average shearing stress is,BAPTaveA? Shearing stress distribution varies from zero atthemembersurfacestomaximumvaluesthatAmay be much larger than the average value: The shearing stress distribution cannot be assumedto be uniform.4
Shearing Stress • Forces P and P’ are applied transversely to the member AB. A P ave • The corresponding average shearing stress is, • The resultant of the internal shear force distribution is defined as the shear of the section and is equal to the load P. • Corresponding internal forces act in the plane of section C and are called shearing forces. • Shearing stress distribution varies from zero at the member surfaces to maximum values that may be much larger than the average value. • The shearing stress distribution cannot be assumed to be uniform. 4
Shearing StressSingle ShearDouble ShearHEPKKEBAFBNLLDDGHFcKF5-PFPFTave2ave2AAAA5
Shearing Stress A F A P ave Single Shear A F A P 2 ave Double Shear 5