Experimental validation of multiaxial fatigue theories to estimate fatigue life of helical compression spring

High-stress amplitudes and mean stress cycles are expected to be endured by helical compression springs utilized in a two-suspension wheeler's system. Fatigue failure of all these springs brings enormous eventual repair and replacement costs. A fatigue test is conducted to ascertain fatigue strength. The spring test plan is rather extensive due to the limited time and numerous test spring versions. Efforts were made to anticipate the helical spring's fatigue life. Multiaxial fatigue theories are examined in this work. The research paper aims to scrutinize the appropriate techniques that spring manufacturers should employ in the planning stage to calculate the fatigue life of helical compression springs. The criteria of Wang & Brown, Fatemi & Socie, Mitchell, Baumel & Seeger, and Smith & Watson are used in the present investigation. The results of the experiment and the predicted life are compared. Spring fatigue life is overvalued by the Wang-Brown criterion, while the Fatemi-Socie model offers a precise forecast of fatigue life.