2.5 HEAT STRESS IN SERIES COMPOSITE BARS

2.5    HEAT STRESS  IN SERIES COMPOSITE BARS

... When the temperature is raised, the two bars will expand. Total expansion due to temperature rise are:

... However, this expansion was blocked by both ends rigidly mounted. Compressive force, P will be produced to counter this development. From the force equation, we know the power of one is equal to the force of two equal forces 
   ® P1 = P2 = P
Therefore, the extension is arrested by the force P:      S d_p = d_p1  +  d_p2

... Then finally, the unknown amount of expansion by heat is equal total extension by the force  P:     

       

\ forces resulting in the bar:

2. 6   HEAT STRESS IN PARALLEL COMPOSITE  BARS
... Of the bar consists of different types of materials, expansion and contraction depending on the coefficient of linear expansion, ie if  a2 > a1, the second material should expand more than the material one. Therefore, the material having a greater coefficient of linear expansion will experience compressive stress rather small coefficients will experience tensile stress.