Room Temperature Creep Of LD10

Even if the stress remains, many materials will continue to deformation, "creep" is the term used to describe this phenomenon. It is found that the deformation under constant load increase with time even at low ambient temperatures (eg room temperature)in many metal materials, which is known as room temperature creep. However, researches about creep for the aluminum alloy are now focused on the high temperature creep deformation behavior, ignoring the amount of creep deformation at room temperature. With the development of measurement techniques and the improvement of required accuracy, the deformation of time-dependent deserves attention. Therefore, LD10 aluminum alloy after aging is selected as experimental material. The experiments were performed on a DNS 100 testing machine by using standard round smooth tension specimens. This paper investigates the long-term static and short-cycle state creep at room temperature, and its influencing factors such as unidirectional tensile and compressive stress, cycle power, loading rate, service time. The main results were as follows.1. Significant time-dependent deformation of LD10 aluminum alloy under constant loading is observed at room temperature. When the stress level is much lower than the tensile strength of the material, creep of LD10 aluminum alloy at room temperature comply withαcreep law, without an acceleration stage; room temperature creep rate decreased rapidly with time, and the amount of creep strain mainly concentrated in the primary stage. During the constant loading, the first few minutes of deformation accounts for the accumulation of most of the deformation, which determines the size of the creep.2. At various loading stress levels, RTC is strongly dependent on the stress level. When the stress level is very low, the creep of LD10 aluminum alloy becomes saturated. When the stress is higher than half the yield strength, there is significant room temperature creep, and the creep strain increased with the improvement of loading stress levels. When the loading stress is constant, there is a peak of creep strain when it varies with loading stress rate changes. Loading history on the subsequent creep behavior at room temperature has a significant impact. After a certain stress level in a longer period of time after the pre creep at room temperature, the stress level, and time-dependent deformation is very small.3. The relationship between creep strain and loading stress for the compressive creep is the same as that for tensile creep. Creep strain gradually increases when stress increases.4. It is shown that the cyclic deformation behaviors of LD10 depend significantly on holding time and loading charts.5. LD10 aluminum alloy showed a typical low-temperature creep. The relationship between deformation and time parameters can be included on the number of three regression equations:to describe. Parameters strongly dependent on stress level, but weak stress rate sensitivity. Continuity based on room temperature creep deformation and tensile stress-strain behavior of test analysis, the ability to quantitatively describe the room temperature creep model.