抄録
In the present paper is presented the report of the study of the fatigue properties of the satin woven glass fabric reinforced polyester. The experiment was made of fatigue test of the above mentioned materials by bending, rotating bending, torsion, tension and compression under varied test temperatures and mean applied stresses. (See Table II)
Further experiment was made also of their static test of tension, bending and torsion in order to find the ratios of their fatigue value to their corresponding static value respectively.
The summary of the results of this study is as follows.
(1) It has been made clear that there is relation between the tension and compression fatigue strength values of the materials and the test temperature and mean applied stress.
This relation is expressed in the following equation.
σf=AT{tanh k σm-tanh k(σm-BT)}+σm
where σf is the fatigue limit of this FRP materials,
σm is the mean applied stress,
k is the constant and AT and BT are the values related to the test temperature.
(2) It has been made clear that the so-called Gerber's law for metals is valid also in our tension and compression fatigue test at room temperature.
