A high-density polyethylene and

{

[

:\\\\alpha =75\\\\times (10^(-6))/(\\\\deg )F]

} block (1) is positioned in a fixture. The block is

2.1in

. by

2.8in

. by

36in

. long. At room temperature, a gap of

0.1in

. exists between the block and the rigid support at

B

. Assume

L_(1)=36

in and

\\\\Delta =0.1

in. Determine:\ (a) the normal stress

\\\\sigma

in block (1) caused by a temperature increase of

52\\\\deg F

.\ (b) the normal strain

\\\\epsi

in block (1) at the increased temperature.

A high-density polyethylene [E=105ksi and =75106/F] block (1) is positioned in a fixture. The block is 2.1in, by 2.8in. by 36in. long. At room temperature, a gap of 0.1 in. exists between the block and the rigid support at B. Assume L1=36 in and =0.1 in. Determine: (a) the normal stress in block (1) caused by a temperature increase of 52F. (b) the normal strain in block (1) at the increased temperature