Effect of Impact Loading Conditions on Soft Tissue Bruise Injury Caused by Blunt Impact

In vivo impact test assuming human-robot interaction has been conducted using live porcine and drop weight impact tester in order to obtain bruise injury criteria. As a results, bleeding was found to occur at the part of adipose tissue in the case of low velocity and high energy conditions. In contrast, bleeding was found to occur at the part of conducted on simple model consist of skin and soft tissue in order to clarify the occurrence mechanism of soft tissue bruise injury caused by impact assuming human-robot interaction. FE model imitated subcutaneous structure of porcine skin used as impact test. Analytical conditions were assumed to the experimental condition that bleeding occurs at the parts of adipose tissue and muscle. As a results, the part of taking maximum first principal strain is good agreement with the bleeding point obtained by experiments. Moreover, it was found that subcutaneous hemorrhage was strongly affected by impact loading conditions than subcutaneous tissue structure.