problem7 Biomaterials The Intersection of Biology and Materi

problem7

Biomaterials: The Intersection of Biology and Materials Science An extrusion technique was employed to fabricate a square polymer sample 4 cm X 4 cm X 0.5 cm. The extrusion process has resulted in the vast\' majority of the polymer chains being aliened preferentially in one direction as shown. In which direction, then, should a tensile force be applied to the sample to result in the greatest resistance to the applied force? Why? Various biomaterials can be used for joint replacement applications, such as hip implants. Which of the three major types of biomaterials t & would you use for the femoral stem? Why? Would integration of the femoral stem with the surrounding tissue be an acceptable biological response? Why or why not?

Solution

Answer 7: Tensile strength should be applied in a direction parallel to most of the fibers for greater resistance to applied force. In this case, the tensile strength should be applied in the direction \'A\'

In a fiber, polymers are arranged both in transverse and longitudinal directions. The resistance offered by the fiber can be calculated by the rule of mixture. The tensile strength is greater when force is applied longitudinally. Most of the fibers of the polymer are in the direction A, thus would offer high resistance. The fibers in direction B will be transverse to the applied force and will offer resistance only due to the matrix. The resistance would be weaker but can withstand the force applied.