Is aluminum strain rate dependent?
The strength of metals is known to be a function of the applied strain rate. For example, 6061-T6 aluminum has been reported to show significant strain rate sensitivity at strain rates over about 102 s-1 [1].
Does Young’s modulus change with strain rate?
Young’s modulus generally increased, across this strain rate range, for both tension and compression. Strength and strain (at maximum load) increased slightly in compression and decreased (for strain rates beyond 1 s(-1)) in tension.
What is the effect of strain rate on yield strength of metals and alloys?
It is observed that the yield strength and the flow stress increase with increasing strain rate, while the uniform elongation decreases with increasing strain rate.
What is the effect of strain rate on mechanical properties?
From the results of this study, it is concluded that the increased strain rates increase the mechanical properties of material. The highest mechanical properties at the strain rate of 20 mm/min with a yield stress value is 563.78 MPa, and the maximum tensile strength is 590.17 MPa.
Is aluminum strain rate sensitive?
Comparing our calculated values of with these results, 5A06 aluminum alloy is strain rate sensitive in high strain rate regimes (the dynamic SRS becomes 3–6 times of the quasi-static one at low strains), but with the increase of strain, this value decreases rapidly and then falls below the level of quasi-static SRS.
What is strain rate dependence?
Rate-dependence in this context means that the deformation of the material depends on the rate at which loads are applied. The sliding element can have a yield stress (σy) that is strain rate dependent, or even constant, as shown in Figure 1c.
What does Young’s modulus depend on?
The Young’s Modulus of a material is a fundamental property of every material that cannot be changed. It is dependent upon temperature and pressure however. The Young’s Modulus (or Elastic Modulus) is in essence the stiffness of a material. In other words, it is how easily it is bended or stretched.
Does Young’s modulus depend on stress and strain?
Stress does not depend on Young’s modulus in the elastic region. Hooke’s law states that stress is directly proportional to the strain within the elastic limit. A higher Young’s modulus will reduce the strain induced in the material, and hence the stress remains more or less same.
How are the strength and ductility of metals affected by strain rate?
Testing Speed/Strain Rate Generally, higher strain rates have an adverse effect on the ductility of materials. Meaning, Elongation values decrease as the strain rate increases. Metals that are brittle are more sensitive to strain rate.
Why does yield strength increase with strain rate?
As the speed increases, the yield strength and modulus also increase. The material appears to be stronger and stiffer simply due to the increase in strain rate, an effect that can also be achieved by keeping the strain rate constant and incrementally reducing the test temperature.
Does increasing strain rate increase ductility?
However, the stabilising effect of the strain rate sensitivity is dominating and leads to an increase in ductility. On the other hand, increased strain rates reduce the local fracture strain leading to an increased dynamic notch sensitivity.
How would the mechanical properties of polymers be affected by the strain rate rate of loading and why?
The mechanical properties of most materials vary with the rate of loading and this effect is particularly evident in polymers. Increasing strain rate has the effect of increasing both the modulus and the yield stress and flow stress of a polymer.
Is strength reduction in aluminum alloys a kinetically dependent process?
Therefore, strength reduction is also a kinetically dependent process. 6xxx-series (Al-Mg-Si) aluminum alloys are precipitation hardened (heat treated) whose primary strengthening mechanism is through precipitate growth under controlled heating (aging) to a desired state (e.g., T6) (Dieter 1976; Edwards et al. 1998 ).
Is there a high temperature mechanical behavior data for aluminum 5083-h116?
The high temperature mechanical behavior data is presented to provide a comprehensive description of the high temperature response of the 5083-H116 and 6061-T651. It is hoped that such a dataset, and its associated understanding, aids design efforts with the selected, and similar, aluminum alloys.
Does aluminum residual mechanical behavior change following fire?
However, limited research has been conducted on the residual mechanical behavior of aluminum following fire. This is a pertinent issue that requires consideration to effectively evaluate structural stability following a fire and assess replacement of fire damaged structural elements.
How does dislocation recovery reduce the strength of aluminum?
Dislocation recovery and precipitate growth at lower temperatures (150 – 250°C) also reduces strength through dislocation wall cell (subgrain) coarsening (Vandermeer and Hansen 2008) and, to a lesser extent, dilution of the Mg solid solution content in the aluminum matrix (Popović and Romhanji 2008 ).