جدxجد
09 - 11 - 08, 07:29 PM
Thermal Stress,
WHEN THE TEMERATURE OF AFREE ROD IS INCREASED , IT EXPANDS .
IF THE ORIGINAL LENGTH OF AROD IS Z
THEN THE INCREASE IN LENGTH IS X DUE TO INCREASE IN TEMERATURE T
X=Q Z T
WHERE Q IS CALLED THE LINEAR EXPANSION COEFFICIENT
WHEN THE ROD IS FIXED AT ITS END AND HEATED IT CANOOT EXPAND AND
.Thermal Stress, WILL BE PRODUSED IN THE ROD.
WE KNOW THAT
X/Z=Q T
BUT
F/A = Q (X/Z) 1
THE THERMAL STRESS IS THUS
(F/A)THERMAL = Y Q T
WHEN THE TEMERATURE OF AFREE ROD IS INCREASED , IT EXPANDS .
IF THE ORIGINAL LENGTH OF AROD IS Z
THEN THE INCREASE IN LENGTH IS X DUE TO INCREASE IN TEMERATURE T
X=Q Z T
WHERE Q IS CALLED THE LINEAR EXPANSION COEFFICIENT
WHEN THE ROD IS FIXED AT ITS END AND HEATED IT CANOOT EXPAND AND
.Thermal Stress, WILL BE PRODUSED IN THE ROD.
WE KNOW THAT
X/Z=Q T
BUT
F/A = Q (X/Z) 1
THE THERMAL STRESS IS THUS
(F/A)THERMAL = Y Q T