Abstract
In order to evaluate the fatigue effects on 304L Stainless Steel, the internal friction or damping of the material have been investigated by means of dynamic mechanical analysis (DMA), using single cantilever test modes. Before DMA measurement, the 304L plates are loaded with different cycle number and stress amplitude to simulate different fatigue condition. The amplitude dependant internal friction (ADIF) of 304L small sample is measured. It shows that the ADIF curves of DMA are associated with the pre-fatigue loading. One ADIF peak is observed near the critical strain amplitude. The DMA data of different pre-stressed samples (cyclic stress amplitude from ±80MPa to ±200MPa) show that the height of ADIF peak increases with the pre stress value. The mechanism of the peak is discussed in the paper. The results indicate that a clear correlation exists between fatigue condition and internal friction curve, so that the fatigue behaviour of 304L stainless steel can be evaluated from DMA measurements.
Highlights
Type 304L stainless steel, as its corrosion resistance and excellent mechanical properties, has always attracted attention of manufacturing industries, and it is widely used in industry of chemistry and nuclear energy
The amplitudedependent internal frictions (ADIF) of four samples are almost the same when the strain is below 0.1% and the ADIF increase with the increasing of strain
The study shows that dynamic mechanical analysis equipment can be applied for the internal friction or damping characterization of 304L SS
Summary
Type 304L stainless steel, as its corrosion resistance and excellent mechanical properties, has always attracted attention of manufacturing industries, and it is widely used in industry of chemistry and nuclear energy. Energy dissipation in materials, termed damping or internal friction (IF), is caused by a wide range of physical mechanism, depending on the material, temperature, strain amplitude, and frequency of cyclic loading involved [1]. The DMA can determine changes in sample properties resulting from changes in five experimental variables: temperature, time, frequency, force, and strain. It can measure many properties of material, including: modulus (storage modulus and loss modulus), internal friction or damping, creep, stress relaxation, glass transitions, and softening points. The prior deformation was performed on tensile loading and results show that the internal friction of the steel increases with the magnitude of cold working deformation. The relationship between the ADIF and cyclic stress amplitude was discussed
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