硬質ポリウレタンのRIM成形品の静的曲げ特性に関する最適層構成

概要

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Rigid polyurethane RIM (Reaction Injection Moldin) produced an integral-skin foam consisting of a high density skin layer and a low density core layer. In the three-point bending tests of such molding made by RIM, their failure modes were classified as follows: (1) The skin layer on the tensil side at the loading point was failed by tensil stress. (2) THe skin layer on the compressive side at the loading point was failed by compressive stress, causing wrinking bucking. In the previous paper, basic equations were derived to predict the flexural properties of the molding made by RIM, which showed the above two failure modes. The experimental results were successfully explained by using these equations. In this paper, theoptimum layer structure was discussed in two cases. One was concerned with the layer structure that maximizes the flexural strength of the molding made by RIM with a given overall density, and the other was concerned with the layer structure that minimizes the overall density of the moldings made by RIM with a given flexural strength. In addition, the effct of material constants expressing mechanical properties of rigid polyurethane and polyurethane foam on flexural strength was discussed. The results obtained here should be useful to the optimum structural design of the moldings made by RIM.
社団法人日本材料学会の論文
1985-11-15