F26 Working temperature The spring material used has a working temperature of up to 250 °C. This rating is an approximation since the actual approved working temperature will also depend on factors such as load. It is worth noting that above 100 °C the modulus of elasticity decreases and with a reduction in tension setting starts to occur. Extended Spring Life: Spring Displacement Values The largest permissible displacement is indicated by S6 – offering about 62% of the "total" displacement of the wire-to-wire compacted spring (= Sn ). This displacement will induce a shear stress of τadmis. of 800 N/mm². The associated stress differential during oscillations should not exceed 400 N/mm² (= τh ). Calculation of spring forces Simple multiplication of the spring coefficient R with the applicable displacement S (mm) yields the spring force value (N). Spring Force versus Spring Displacement The relevant tables show the force values for selected displacements of 45, 62, 80 and 100% compression. Intermediate force values can be extra‑polated from the Stress/Spring Life Diagram. Service Data for Limited-/Extended Spring Life The achievable service life of helical compression springs depends to a large extent on the composition of the spring wire, the operating conditions, and on design parameters. In all applications with oscillating spring displacement, careful selection of both preload values and compressive displacement are prerequisites for extended spring life, as confirmed by the permissible stress values in the loading data tables and the stress/spring life diagram. Shear stress maxima and spring oscillation stress differentials are a direct function of the quality of the spring wire. FIBRO High Performance Compression Springs are made exclusively from special alloyed chrome-steel. For extended spring life under oscillating load changes, the maximal shear stress τzul. is 800 N/mm², of which some 400 N/mm² = (τh ). Higher stress levels are permissible only under the proviso of limited life expectancy, or in cases of static and quasi-static load conditions. Springs subjected to dynamic load conditions also suffer impairment to their life expectancy through influences such as extreme operating temperatures, transversal stress components, shock loads, and resonant vibration frequencies. In all these instances, a lowering of the stress levels assists towards better spring life. HIGH PERFORMANCE COMPRESSION SPRINGS - DESCRIPTION
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