SIMPLE STRESS AND STRAIN
SIMPLE STRESS AND STRAIN STRESS : STRESS IS THE INTERNAL RESISTANCE OFFERED BY THE BODY TO DEFORMATION. STRESS IS USUALLY MEASURED BY THE INTENSITY OF FORCE PER UNIT AREA. STRESS = P/A WHERE P= FORCE A= AREA OF CROSS SECTION UNIT OF STRESS: N/m 2 ,KN/m 2 ,N/mm 2 WHY STRESS IS EQUAL TO FORCE/AREA? DID YOU THOUGHT ABOUT IT WHY STRESS IS FORCE/AREA,DON'T WORRY I'LL EXPLAIN,THERE ARE SOME ASSUMPTIONS AND THEY ARE THE OBJECT IS HOMOGENEOUS THE OBJECT IS ISOTROPIC AND THE OBJECT ACTS AS A SINGLE MEMBER AND NOT AS LAYERS. WHEN A LOAD IS APPLIED THE WHOLE OBJECT UNDERGOES DEFORMATION AND THE VALUE OF DEFORMATION IS SAME AT EVERY POINT ON THE CROSS SECTION OF THE BEAM PERPENDICULAR TO THE LOAD.THIS HAPPENS DUE TO THE LOAD IS DISTRIBUTED TO THE WHOLE AREA EQUALLY. NOW, 10X = 10KN ( HERE X= UNIT AREA ) 1X = ? FOR LOAD APPLIED ON UNIT AREA BY CROSS MULTIPLYING WE GET = 1X * 10KN /10X = 1KN