Test piece tensile test system for optical strain field measurement under ultralow temperature environment

Abstract

The invention belongs to the technical field of structural low-temperature static test and particularly relates to a test piece tensile test system for an optical strain field measurement under an ultralow temperature environment. A liquid nitrogen tank is fixed on a force-bearing ground rail. A fixed flange is connected to a side force-bearing board of the liquid nitrogen tank. The fixed flange is connected to a first test piece clamping head and then is successively connected to a tensile test piece and a second test piece clamping head which is connected to an adaptor tooling. A pulley bracket is fixedly connected to a fixed force-bearing bottom board of the liquid nitrogen tank, a fixed pulley being installed onto the pulley bracket. A force-bearing portal frame is set up outside the liquid nitrogen tank and includes a force-bearing beam, a vertical pillar and a pedestal. A force sensor is successively connected to a connecting pull rod and an actuator cylinder to form a tension force load applying system. One end of a steel wire rope is connected to the adapting tooling, and through direction turning on the fixed pulley, the other end of the steel wire rope is connected to the force sensor on the tension force load applying system. The actuator cylinder is connected to the force-bearing beam through a regulation board. A CCD camera and an LED light source are arranged over the liquid nitrogen tank.

Description

technical field [0001] The invention belongs to the technical field of low-temperature static test of structures, and in particular relates to a specimen tensile test system for measuring optical strain field in an ultra-low temperature environment. Background technique [0002] The new generation of launch vehicles uses liquid hydrogen and liquid oxygen as the propellant medium. The low temperature environment of liquid hydrogen and liquid oxygen makes the storage tank withstand the alternating high and low temperature environment during flight. However, the different welding processes used in the storage tank directly affect the storage capacity. The ultimate bearing capacity of the tank in a low temperature environment requires accurate acquisition of the mechanical performance parameters of different regions of the welded joints to provide more comprehensive and reliable test data and design basis for the structural design of the tank. At present, the welding process of ...

AI Technical Summary

Problems solved by technology

However, the above studies considered the welded joint as a whole for analysis, and did not refine the area, let alone obtain the mechanical performance parameters of the welded joint in different regions

Images