FRPの機械的性質

直交配列に基づく諸因子の影響

抄録

Polyester resin laminates reinforced with glass fibers have recently been put to good use for industrial purposes, for instance to form mechanical members of electric apparatuses and automobiles, to substitute metals. Although the mechanical properties of the laminates have often been reported, few are really the results of experiments based on studied method and design.
Our investigation was carried out using the orthogonal array table type L₁₆. Eight factors were chosen and examined with reference to the two levels:
(A) The kind of resin,
(B) The style of weaving the glass fabric,
(C) Whether finishing touches to be given to the glass fabric or not.
(D) The molding method,
(E) The hardening velocity,
(F) Whether to use the filler or not to,
(G) Whether to cure the laminate or not to,
(H) Whether the dipping of the laminates in the sea water to be processed or not.
The tests were carried out in the atmosphere of 20±1°C, 65±3%RH.
The main results obtained are as follows:
1) Isophthalic acid polyester produces favorable effect on bent members, especially so under repeated stress.
2) Satin-like style of weaving produces better effect than plain style of weaving.
3) The volan finishing touches given to the glass fibers show better effect than in the case of no finishing touches ever being given them.
4) The laminates containing the filler fare worse than those without the filler.
5) The effect of interaction A×C and of that F×D is large on breaking stress.
6) The effect of interaction A×E is large on fatigue strength.
7) The effect of interaction A×D is large on moduli.
8) No effect of either G or H is recognized either on breaking stress or on moduli.