Creep Testing Machines are designed for testing creep properties of materials used primarily for the production of high temperature stressed parts. Creep machines are used in the evaluation of materials for boilers, gas turbines, jet engines, pipes or any application where a change of the material at high temperatures under loads occurs. Understanding how metals at high temperatures react is useful in designing systems resistant to failure.
The test includes the creep in tension under constant load and maintaining a constant temperature. The measurement of the specimen is then recorded over a certain time. Creep tests are manifested in three stages: primary or Stage I; Secondary or Stage II; a high or Stage III. Stage I, or the primary flow occurs at the start of the test, and the creep is usually temporary, and occurs at a constant speed. Creep resistance increases until it reaches Stage II. In the second stage, or secondary flow, the flow rate becomes roughly stable. This stage is often referred to as a steady state of flow. In stage III, or tertiary creep, the flow rate begins to accelerate, as the cross sectional area decreases as a result of constriction and the effective area of the specimen is reduced. Finally, the specimen will be torn off.
Creep test is usually used for determining the minimum rate the creep in the phase II. Engineers need to calculate the expected deformation when designing systems. For Creep test it is needed to determine the time when a material failure occurs. Data is exported into graphical format, where the vertical axis marks the elongation of the specimen and the horizontal axis identifies the time. The line, or preferably the serpentine curve, is usually achieved at each temperature of interest. The test of stress rupture is used to determine the time prior to failure and stretching.
These machines of series 6.xx.C1 allow carrying out tests at constant temperature up to 1200 °C, wherein the deformation is recorded at specified time intervals. Constant load weight is generated via a lever mechanism. Loading time in these machines can be up to 10,000 hours.
These machines of series 6.xx.C allow carrying out tests at constant temperature up to 1200 °C, wherein the deformation is recorded at specified time intervals. Constant load is exerted by a constant spring via a lever mechanism and a strain gauge sensor. Loading time in these machines can be up to 10,000 hours.
These machines of series 6.xx.C3 allow carrying out tests at a constant temperature up to 1200 °C, wherein the deformation is recorded at specified time intervals. A constant load for these machines is exerted by a special low-speed AC drive with high durability.