The fatigue life of microcellular polycarbonate specimens of five different relative densities ranging from 0.52 to 0.97 was measured in tension-tension tests on dumbbell specimens. Fatigue life varied with relative density and maximum nominal cyclic stress. The fatigue life of microcellular polycarbonate with relative foam density of 0.97 exceeded that of solid polycarbonate by over 400 percent. Fatigue life decreased with decreased relative foam density.
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References
1.
Boukhili, R. , R. Gauvin and M. Gosselin.1989 "Fatigue Behavior of Injection Molded Polycarbonate and Polystyrene Containing Weld-Lines," SPE Technical Papers, 35 1566
2.
Colton, J. and N.P. Suh1987 "Nucleation of Microcellular Foam with Additives Part II Experimental Results," Poly. Eng. Sci., 27(7) 493
Hertzberg, R.W. and J.A. Manson1973 "Micromechanisms of Fatigue-Crack Advance in PVC ," J Mat Sci , 81554
5.
Kweeder, J.A. , N.S. Ramesh, G.A. Campbell and D.H. Rasmussen1991 "The Nucleation of Microcellular Polystyrene Foam ." SPE Technical Papers, 37 1398
6.
Kumar, V.1988 "Process Synthesis for Manufacturing Microcellular Thermoplastic Parts A Case Study in Axiomatic Design," Ph D Thesis, Dept Mech Eng , MIT
7.
Kumar, V. and N.P. Suh1990 "A Process for Making Microcellular Thermoplastic Parts ," Poly Eng Sci , 30(20) 1323
8.
Kumar, V. and O.S. Gebizlioglu1991 "Carbon Dioxide-Induced Crystallization in PET Foams," SPE Technical Papers, 37 1297
9.
Kumar, V. and J.E. Weller1991 "Microcellular Polycarbonate—Part I Experiments on Bubble Nucleation and Growth," SPE Technical Papers, 37 1401
10.
Kumar, V. and M.M. VanderWel1991 "Microcellular Polycarbonate- Part II Characterization of Tensile Modulus," SPE Technical Papers, 37 1406
11.
Kweeder, J.A., N.S. Ramesh, G.A. Campbell and D.H. Rasmussen1991 "The Nucleation of Microcellular Polystyrene Foam:' SPE Technical Papers, 37 1398
12.
Martini, J.E. , N.P. Suh and F.A. Waldman1984U S Patent No 4,473,665
13.
Matsumoto, D.S. and M.T. Takemon1985 "Shear and Craze Development in the Fatigue of Ductile Amorphous Polymers," J Mat Sci , 20873
14.
N.J. Mills and N. Walker1980 "Fatigue Crack Initiation in Glassy Plastics in High Strain Fatigue Tests," J Mat Sci , 151832
15.
Skibo, M.D. , R.W. Hertzberg, J.A. Manson and S.L. Kim1977 "On the Generality of Discontinuous Fatigue Crack Growth in Glassy Polymers," J Mat Sci , 12531
