A test system and test method for multi-directional stretching of waterproof materials

Abstract

The invention discloses a test system and test method for multi-directional stretching of waterproof materials, including a sample anchoring device, a pressurizing and adjusting device, a three-dimensional scanner, a thickness measuring instrument and a data processing device; the sample anchoring device includes a cylinder and a The flange set on the cylinder; the pressurization and adjustment device includes a pressure supply unit and an air pressure adjustment unit; a three-dimensional scanner is used to scan the initial and deformed contours of the sample to be tested under different air pressures to obtain the initial and different air pressure deformations Contour equation; the thickness measuring instrument is used to measure the initial thickness of the sample to be tested and the thickness of the highest deformation top expansion position under different air pressures; the data processing device is based on the distance between the marked points of the sample to be tested, the highest top expansion of the sample to be tested The distance between the point at the position and the point closest to the highest position of the jacking, the contour equation and the thickness, to obtain the stress-strain curve. The invention realizes the measurement of the stress and strain in the whole process of the sample from the beginning of the deformation to the final failure and destruction.

Description

technical field [0001] The invention belongs to the technical field of mechanical testing of waterproof materials, and more particularly, relates to a test system and a test method for multi-directional stretching of waterproof materials. Background technique [0002] Due to its low elastic modulus, the waterproof material needs to be laid on the cushion in the actual project. Under the action of external force, the cushion structure is deformed, and the waterproof material laid on the cushion is also deformed. In most projects, the deformed waterproof material is in a biaxially stretched state. Therefore, the multi-directional tensile properties of waterproof materials are related to the safety of the entire anti-seepage structure. [0003] At present, the existing biaxial tensile test equipment for waterproof materials mainly includes the traditional biaxial tensile test of plane cross specimens, and the mechanical properties of the tensile test of the cross-shaped speci...

AI Technical Summary

Problems solved by technology

However, due to the limitations of materials and test equipment, the actual liquid swelling test basically maintains a spherical shape at the initial stage. As the pressure increases, the test sample often becomes distorted, and the assumption based on a spherical shape will bring non-negligible errors.

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