The Fundamental aspect of the FRP tensile test piece and FRP tensile strength

摘要

The test material for experiment is made by combining with Fiber glass and polyester resin which is molded by hand-lay-up method， placing Fiber glass and polyester resin in turn. We studied behavior of the deform and the starting point of demolition aiming to break the test piece at the part of effective range which is produced by the use of the primary test records and the refference books. The results obtained are summarized as follows: 1. In the experiment the uniformed type and size of the test pieces to be broken at the effective range could not be found， however the result of the tests indicated the possible width in the effective range of the test piece if the depth is known. 2. Normally there is not much defference in the strength of tensile if the width of effective range is enlarged except in some unusual occations. 3. It seems to be better to decide an appropriate width of the test piece which will be easily broken in the effective range, considering the small width described in the report, rather than merely enlarging the width of the test piece in the effective range. 4. There seems to no difference between the breaking and the spot failure in the test piece will not cause the break， but the split direction to width will.