Preparation device for composite board sample used for tests and method

Abstract

The invention relates to a device for preparing a composite panel smooth in surface, uniform in thickness and used for tests through a vacuum perfusion process, and a method. Auxiliary materials such as diversion nets need to be abandoned for preparation of glass panels smooth in surface, and due to the method, the perfusion speed of resin is low, the flow velocity change of the resin is large and the prepared panels are poor in thickness uniformity. By means of the device and the method, the pore forming manner of multi-hole pressing plates and the perfusion manner of the resin are optimized, and therefore it is ensured that the resin infiltrates enhancement materials at the same speed within a short period of time and the panels uniform in thickness are prepared. Gaskets of the required thickness are placed between a test platform and a perforated plate, and the resin perfusion speed and amount are controlled through a resin flow regulator, and therefore the content stability of fiber in products and the thickness adjustability of the panels are ensured. Compared with the prior art, the standardability of test samples is greatly improved, and the test result has higher reference value.

Description

technical field [0001] The invention relates to the field of testing the mechanical properties of composite material samples used in laboratories, in particular to a preparation device and method for preparing composite plate samples for testing with smooth surfaces and uniform thicknesses by using a vacuum infusion process. Background technique [0002] Composite materials are not only materials, but also structures, and finally products. The reasonable matching between various elements is the key to determine the performance of composite products. Since the composite material itself is a structure, when designing a composite material, one cannot simply select the material, but design the material at the same time. Therefore, knowing the material is not only to understand the performance parameters of the material, but also to master the performance mechanism of the composite material. The performance test of composite materials has become more important, and the quality of...

AI Technical Summary

Problems solved by technology

This common sample preparation method, on the one hand, the use of diversion net and release cloth will leave uneven mesh marks on the surface of the prepared glass steel plate, which will lead to inaccurate thickness measurement and affect the test results

On the other hand, when the fiber content is constant, the stress and modulus obtained by different sample thicknesses are also different, so the thickness control of the sample is particularly important, but the traditional sample preparation method cannot accurately control the thickness

In recent years, many scientific researchers have done a lot of work on the thickness control of the plate. Most of the workers abandon the diversion effect of the diversion net, and use flat plate with holes to ensure the surface smoothness of the product, and use gaskets and other materials to control the thickness of the plate. The thickness of the product is controlled, but the invented device ignores the influence of the resin flow velocity and the difference of the flow velocity on the thickness uniformity of the plate during the infusion process

In the prior art, gaskets are placed on the mold to control the thickness of the glass plate, and a stainless steel porous plate similar to an isolation film is laid on the glass fiber cloth to control the flatness of the glass plate surface. This method uses a stainless steel porous plate to inject resin into the holes. The method can easily cause excessive accumulation of resin at the hole, and the smoothness of the glass fiber at the hole is easily affected during the pumping process, and the thickness uniformity is not good

In the prior art, there is also a buckle connection between the upper formwork and the lower formwork, and a gasket of a certain thickness is used outside the pouring area to control the thickness of the plate. The point-type glue injection and point-type air extraction adopted in this device Due to the absence of the diversion effect of the diversion net, the resin infusion speed is slow, and because the viscosity of the resin increases with the prolongation of the infusion time, the infusion speed is slower, which can easily cause the thickness of the glass plate attached to the injection port to be higher than that around the suction port. As a result, the thickness uniformity of the prepared glass steel plate is poor

Images