A pre-tensioned dynamic tensile mechanical properties testing method for deployment and retrieval cables

The deployment and retrieval cables are a crucial link between deep-sea exploration equipment and the vessel. The deployment and retrieval safety of this cables process directly affects the operational reliability of the ocean exploration equipment. Therefore, it is of significant importance to conduct tests on the static and dynamic mechanical properties of cables under simulated marine pressure conditions. Due to the limitations of traditional strain measurement methods in dynamic mechanical property tests, which are not suitable for the specific functional and structural requirements of the deployment and retrieval cables specimens and test apparatus, this paper proposes a pre-tensioned dynamic tensile mechanical property testing method for deployment and retrieval cables. Firstly, based on the working conditions and load characteristics of the deployment and retrieval cables during the deployment and retrieval process of deep-sea exploration equipment, a pre-tensioned dynamic tensile mechanical properties test device for deployment and retrieval cables was developed. The composition principles, structural features, and incident wave design of the device are discussed. Then, based on one-dimensional stress wave theory, the limitations of strain measurement methods in traditional dynamic mechanical property tests are analyzed. A pre-tensioned dynamic tensile mechanical properties testing method for deployment and retrieval cables is proposed, and the relevant analytical equations are derived. Finally, using the pre-tensioned dynamic tensile mechanical properties test device for deployment and retrieval cables as an example, the feasibility of the testing method is verified through numerical simulation. This testing method can also be applied to dynamic tensile tests of other materials.