Abstract
The whitening phenomena of injection molded polyoxymethylene was studied, and the influence of molecular weight on the whitening and the fracture were investigated. A high molecular weight material showed whitening at rather low stress, and its fracture toughness was fairly high, compared with low molecular weight materials. With the aid of an image processing technique, the length of the cracktip whitening area was measured clearly and continuously with the increase of the tensile load, and the cracktip area of both high and low weight materials were approximated with the Dugdale model. The experiments and theory showed good agreement and the measurement of the cracktip opening displacement (COD) was also found to be in agreement with the calculation from the Dugdale model.
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