Abstract
Few studies have been made on the fracture mechanics of polymers, their resistance to plastic failure, fatique rupture, and the adverse effects of environmental conditions, in contrast to the numerous studies conducted on metallic materials. Since fatigue is characterized by very local and cyclic fractures, in the present study a real-time fine-grid method was applied to study the fatigue rupture of polymers: to examine changes in local strain at the root of the notch during the process of crack initiation, the local strain at the tip of the crack during crack propagation and the relation between the plastic zone formed in front of the crack tip and the rate of crack propagation. As a result, strong correlation between three proposed parameters of the local crack-tip strain, the crack initiation and the propagation rate was obtained, and the mechanism of low-cycle fatigue rupture of polymers could be discussed.
Similar content being viewed by others
References
Misaki, T. andKishi, J., “Effect of Notches and Glass Fiber Reinforcement on Fatigue Behavior of Polycarbonate” (in Japanese),J. Appl. Polym. Sci.,22,2063–2067 (1978).
Banasiak, D.H., Grandt, A.F. andMontulli, L.T., “Fatigue Crack Retardation in Polycarbonate”,J. Appl. Polym. Sci.,21,1297–1309 (1978).
Nagasaka, S., “Fatigue Crack Closure Phenomena in Polymers” (in Japanese), Preprint of 16th Symp. Stress and Strain Measurement, 1–4 (1984).
Nagasaka, S., “Photoelasto-Plastic Effect in Polycarbonate Under Repeated Loading” (in Japanese), Preprint of 17th Symp. on Stress and Strain Measurement, 69–72 (1985).
Nagasaka, S., “The Measurement of the Plastic Zone Size in Fatigue Crack Plate made of Polycarbonate” (in Japanese), Preprint of 19th Symp. on Stress and Strain Measurement, 57–60 (1987).
Shimamoto, A., “Calibration of Elastoplastic Behavior for Photoelastic Models” (in Japanese),Trans. Jap. Soc. Mech. Eng. (A),47 (421),959–963 (1981).
Shimamoto, A., “Optical Measurement of Principal Strains in Plastic Region” (in Japanese),Trans. Jap. Soc. Mech. Eng., (A),51 (472),2765–2770 (1985).
Shimada, H. andFuruya, Y., “Strain Measurement at the Tip of Fatigue Crack by Grating Method” (in Japanese),J. Jap. Soc. for Nondestructive Inspection,26 (7),463–466 (1977).
Shimada, H. andFuruya, Y., “Application of Crack-tip-strain Loop to Fatigue-Crack Propagation” (in Japanese),Experimental Mechanics,21 (11),423–428 (1981).
Sato, T., Shimada, H. andFuruya, T., “Crack Initiation and Local Strain Behavior from Notch Root in Low Cycle Fatigue” (in Japanese),Jap. Soc. Mech. Eng., (A),51 (466),1534–1540 (1985).
Furuya, Y. andShimada, H., “Fatigue Crack Initiation from Notch Boot”, (in Japanese),Eng. Fract. Mech.,23 (6),983–989 (1986).
Shimada, H. andFuruya, Y., “Local Crack-Tip Strain Concept for Fatigue Crack Initiation and Propagation” (in Japanese),Trans. ASME, J. Eng. Mat. Tech.,109 (4),101–106 (1987).
Kikukawa, M., “Damage Accumulation in Fatigue Process” (in Japanese), Preprint of 15th Symp. on Material Strength and Fracture (in Japanese), 71–78 (1970).
Hudak, S.J., Jr., “Small Crack Behavior and the Prediction of Fatigue Life”,Trans. ASME J. Eng. Mat. Tech.,103 (1),26–36 (1981).
Manson, S.S., “Interfaces between Fatigue, Creep and Fracture”,Int. J. Fract. Mech.,2,327–363 (1966).
Socie, D.F., Morrow, J. andChen, W.C., “A Procedure for Estimating the Total Fatigue Life of Notched and Cracked Members”,Eng. Fract. Mech.,11,851–857 (1979).
McClintock, F., “On the Plasticity of the Growth of Fatigue Cracks”,Fracture of Solids, ASME Conf. 20, Interscience, New York (1963).
Miyoshi, T., Shiratori, M., Zako, M. and Sakata, S., “FEM Analysis of Fatigue Crack Propagation”, FEM Analysis, Jikkyo shuppan Co., Ltd., (1982).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Shimamoto, A., Takahashi, S. & Yokota, A. Fundamental study on rupture by low-cycle fatigue of polymers applying the fine-grid method. Experimental Mechanics 31, 65–69 (1991). https://doi.org/10.1007/BF02325726
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02325726