Stress Evaluation Technique of Helical Spring with Modified Design Parameters

Abstract

The developments of NiTi-based shape memory alloys equipment/devices have taken place by researchers in many fields with helix-shaped springs. NiTi-based SMA s devices or equipment are depended on commonly terms displacement moves or load capability done by the actuator materials. The work presented the stress evaluation techniques represents a development of NiTi SMA s based equipment/device by utilizing forces/load capacities produced within their actuation at various preset conditions. This dissertation includes the development of NiTi-based mechanical model/equipment as a major application (Smart Fork-Lift; including physical-loaded helical springs preparation, design, simulation and fatigue life) and development of NiTi-based mechanical model/device as the minor application (A simple solenoid valve). This work also included the preparation of NiTi based intelligent SMA helical springs by the application of various fixture tools and clamping/holding devices and heat treatment processes. The basic actuation parameters and modified or exploring them for NiTi-based SMA helical springs by the development of a physical model for various working parameters (up to 20Kg) also done. This work considered the effect of slender-wires diameters, metallurgical and mechanical fatigue properties of NiTi wires. The methodology adopted by experimental set-up comprising following equipment have been utilized as muffle furnace, sensors and load-cells, thermocouple and electronic measuring instruments, DPM s based on operational amplifiers, soldering m/c and TIG welding m/c, workshops tools, basic electrical-electronic components, electronic scanning microscope for metallurgical properties. In the presented work, Ni-Ti SMA s helical springs, modified design of helical spring, and CAD Analysis: For its design, fatigue: Solid works designer (Version-2017) are used. newline