Pretension and tensile impact test apparatus capable of simulating full-sea-depth environment

A pretension and tensile impact test apparatus capable of simulating a full-sea-depth environment, comprising:

• a pre-tensioning device;
• a Hopkinson bar device;
• a seawater pressure simulation device;
• a power source group;
• and
• an acquisition control unit;
• wherein the Hopkinson bar device comprises an input rod, an air compressing device, a test sample and an output rod;
• the pre-tensioning device, the input rod, the air compressing device, the seawater pressure simulation device, the test sample and the output rod are arranged in sequence on the same axis;
• the air compressing device comprises an air cylinder and an impact piston;
• the impact piston is in clearance fit with the air cylinder;
• the input rod is coaxially connected to the impact piston;
• one end of the input rod is connected to the pre-tensioning device, and the other end of the input rod extends into the seawater pressure simulation device and is in clearance fit with a first circular hole on the seawater pressure simulation device;
• the output rod, the test sample and the input rod are coaxially arranged;
• a first end of the test sample is adhesively connected to the input rod, and a second end of the test sample is adhesively connected to the output rod;
• the test sample is provided inside the seawater pressure simulation device;
• and an end of the output rod away from the input rod is fixed;
• the power source group is configured to drive the pre-tensioning device and the input rod to stretch the test sample;
• and
• the acquisition control unit comprises a computer, a first strain gauge and a second strain gauge;
• the first strain gauge is mounted on the input rod;
• the second strain gauge is mounted on the output rod;
• the first strain gauge and the second strain gauge are connected to the computer;
• and the computer is connected to the power source group;
• wherein the pre-tensioning device comprises a magnetostrictive displacement sensor, a hydraulic cylinder, a piston, a piston rod, a locking ring and a tension sensor;
• the piston is provided inside the hydraulic cylinder;
• the magnetostrictive displacement sensor is provided on the piston;
• the piston is connected to the piston rod;
• an end of the piston rod extends out of the hydraulic cylinder;
• the end of the input rod connected to the pre-tensioning device is provided with a connecting hole;
• the end of the piston rod extending out of the hydraulic cylinder is provided in the connecting hole, and is provided with a flange;
• the locking ring is provided at the connecting hole;
• the tension sensor is arranged between the flange and the locking ring;
• and the magnetostrictive displacement sensor and the tension sensor are connected to the acquisition control unit.