The fracture toughness and the craze shape of a propagating single crack/craze in polymethylmethacrylate has been measured in a very low pressure toluene gas environment by means of optical interferometry. Below a velocity of 0.01 mm/s the craze size increases up to 4 times the craze size in air, whereas the fracture toughness remains identical to the toughness in air. Above 0.01 mm/s the crack/craze behaves like a crack/craze in air.
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Schirrer, R., Galleron, G. Optical Interferometry on Crazes in Solvent Vapours at Very Low Pressure in Polymethylmethacrylate.. MRS Online Proceedings Library 79, 287–291 (1986). https://doi.org/10.1557/PROC-79-287