3D-DIC Analysis in Interlaminar Shear Impact Test of Composite Materials

Introduction

Composite materials feature higher specific strength and specific stiffness than metal materials. For this reason, yearly increasing amounts of composite materials are used in passenger and various transport aircraft in order to improve fuel efficiency through weight reduction. However, since the superior properties of composite laminated materials are limited to the fiber direction and layers are adhered only using matrix resin, these materials are very low in strength. If the strength between layers is low and an external load is applied, delamination will easily occur and cause a reduction in compressive strength. Therefore, evaluation of interlaminar properties is important when evaluating composite laminated materials. Furthermore, since these materials may be subject to impact loads when used in transport aircraft, it is also important to determine the impact properties in addition to static properties. In this research, strain distributions resulting from interlaminar shear impact test, which employed the short- beam method based on JIS-K7057, were visualized as an evaluation of interlaminar properties. Strain distribution was visualized using two HPV-X2 high-speed video cameras and 3D digital image correlation (DIC) analysis

June 2, 2017 GMT