Stress 上清充通大￥ SHEAMGRAI DUD TONO UHTVEREETTY Normal stress and shear stress The stress varies as the change of slicing direction S=- F F cos0=oo cose cos0 00 o=Scose=0o cos20 1 t=Ssinθ=-o sin28 2 "Normal stress"is the stress component in the normal direction of the plane "Shear stress"is the stress component coplanar with the plane Stress in tensile test Institute of Forming Technology Equipment 12
Institute of Forming Technology & Equipment Stress Normal stress and shear stress 12 0 0 0 cos cos cos F F S A A 2 0 0 cos cos 1 sin sin 2 2 S S Stress in tensile test “Normal stress” is the stress component in the normal direction of the plane “Shear stress” is the stress component coplanar with the plane The stress varies as the change of slicing direction
Stress 上清充通大￥ SHEAMGRAI DUD TONO UHTVEREETTY Definition of stress G=s t=0 Institute of Forming Technology Equipment 13
Institute of Forming Technology & Equipment Stress Definition of stress 13
Stress 上清充通大米 SHEAMGRAI DUD TONO UHTVEREETTY Stress state in a single point 0 There are nine stress components. Unless txy=tyx there would not be a moment 《x8 balance. Oy Lyx T 60 O 0 80 o 7 r0 Institute of Forming Technology Equipment 14
Institute of Forming Technology & Equipment Stress Stress state in a single point 14 x yx zx xy y zy ij xz yz z T z rz z zr r r ij z r T There are nine stress components. Unless τxy= τyx, there would not be a moment balance
Stress @上克大￥ IUHIVEEDTY Stress state in a single point 工8p Sign of stress Tax 以 ay 划 Ox Sign of plane Direction of stress Sign of stress + + + + + + Institute of Forming Technology Equipment 15
Institute of Forming Technology & Equipment Stress Stress state in a single point 15 Sign of stress Sign of plane Direction of stress Sign of stress +++ + ‐ ‐ ‐ + ‐ ‐ ‐ +
Stress 上清充通大￥ SHEAMGRAI DUD TONO UHTVEREETTY The stresses acting on arbitrary plane 国 Institute of Forming Technology Equipment 16
Institute of Forming Technology & Equipment Stress The stresses acting on arbitrary plane 16