The electro-hydraulic servo tensile testing machine, with its high precision, high dynamic response, and multi scenario adaptability, undertakes the core tasks of material performance verification, key component reliability testing, and structural safety evaluation in the shipbuilding industry. The following is an explanation from three dimensions: application scenarios, technical value, and typical cases:
Metal material testing
For ship structural steel (such as high-strength AH36, DH36), aluminum alloy, and composite materials (carbon fiber reinforced plastic), tensile strength, yield strength, and elongation at break are determined through tensile testing to ensure that the materials meet the standards of classification societies (such as CCS, DNV). In the special coating process for ships, tensile testing of coating adhesion is required to verify the durability of the coating material in marine environments.
Evaluation of Polymer Materials
Marine polymer materials such as lifeboat boards and seals need to be evaluated for compressive strength and elastic modulus through compression/bending tests, and combined with salt spray corrosion tests to simulate aging performance in marine environments. Using an electro-hydraulic servo testing machine to conduct tensile compressive cyclic testing on marine rubber seals and analyze their fatigue life under alternating loads.
Anchor chain and cable testing
Anchor chains need to be verified for tensile strength through tensile testing (as required by GB/T 549 standard), and combined with bending fatigue testing to simulate cyclic loads under anchoring conditions. For example, a testing machine manufacturer in Wuxi, Jiangsu provided a horizontal tensile testing machine for CSSC Chengxi, which can test the breaking force of anchor chains with a diameter of 120mm and an accuracy of ± 0.5% FS.
Hydraulic system component testing
Hydraulic components such as hydraulic cylinders and speed controllers require dynamic fatigue testing. For example, when repairing the UG-A type electro-hydraulic governor in Chengxi, China Shipbuilding Industry Corporation simulated the dynamic loading of the ship's diesel engine through an electro-hydraulic servo test bench to verify the stability of the governor under high-frequency response. A certain ship laboratory uses an electro-hydraulic servo fatigue testing machine to conduct 100000 pressure cycle tests on hydraulic valves to ensure their sealing performance in high-pressure environments.
Mechanical evaluation of ship hull nodes
Perform bending/compression tests on structural components such as bulkheads and decks, and analyze the stress distribution of nodes under ultimate loads. For example, a research institution conducted bending tests on triangular elbow reinforcement nodes using an electro-hydraulic servo testing machine and found that their ultimate strength was 15% higher than that of circular arc nodes, providing data support for ship structure optimization.
Performance verification of welded joints
Use tensile and impact tests to evaluate the strength and toughness of welds, combined with metallographic analysis to detect welding defects. For example, in the electric propulsion system of hybrid ships, CSIC Saisiyi conducts tensile tests on the welded joints of the motor stator winding to ensure its reliability in vibration environments
High precision and dynamic response
The force control accuracy reaches ± 0.5% FS, and the displacement accuracy is ± 0.05% FS, which can meet the testing requirements of ship materials with micro strain (such as composite materials) and large loads (such as 10000 ton anchor chains). For example, a testing machine manufacturer provides an electro-hydraulic servo system for ship shaft generators, which can simulate dynamic torque loading under wave impact with a frequency response of 50Hz.
Multi standard compatibility and intelligent analysis
Support international standards such as GB, ISO, ASTM, etc., automatically generate stress-strain curves and fatigue life reports. Using an electro-hydraulic servo testing machine that complies with DNV standards to conduct torque testing on the shaft belt power generation system, the data is directly linked to the classification society certification process