Step load testing

Question 2 Is my equipment somehow responsible That is sadly often the case. For example, some electronic loads can show weird glitches in the load profile they present to the converter under dynamic conditions. For example, if we are doing step load testing from 10mA to 200mA, all may be fine. But if we go from 0mA to 200mA, and see an output overshoot/undershoot, it could also be because of the electronic load. We may need to do... 

The step-modified slow strain-rate or Rising Step-Load (RSL ) test produces an increasing stress intensity that is different at each step-load but remains constant with crack extension for a Chaipy-sized SE(B) four-point bend specimen while each load level is maintained constant for a period of time. The rising step-load test was developed as an accelerated low-cost test for measuring the resistance of steels and weldments to IHE or EHE [45,46 ]. The load is constantly increased under displacement control, but incrementally in steps with each step being sustained for a period of time so that the onset of subcritical crack extension can be detected, which is the threshold for the onset of IHE or EHE. The RSL test differs from the SSRTT, which measures the differences in ductility parameters over the... 

The test with the step loading shows that acoustic activity of the solid adhesive joints in the tested carbon plastic is quite low. The maximum on the endurance area was fixed at the predestructive moment. The last is evidence to the fact that the prevailing defect of the adhesive joints is starting its development at the loading level, which is close to the destruction point. 

Figure 2. Standard types of testing loads and their spectrums a - small cyclic pulse loads b - step loads c - growing pulse loads.

Figure 9-4 Too Little Phase Margin Shows Up in a Step-Load Response Test...

The method development process with the multisorbent plate consists of three steps. In step 1, the sorbent chemistry and the pH for loading, washing, and elution are optimized. In step 2, optimization of the percentage organic for wash and elution and the pH of the buffer needed is carried out. Step 3 is validation the method developed from the results of the previous two steps is tested for linearity, limits of detection, quantitation of recovery, and matrix effects using a stable isotope-labeled analyte as an IS. 

Hazard potential for each effluent was calculated using a mathematical formula (the PEEP index) proposed by Costan et al. (1993). This formula integrates the ecotoxic responses of the battery of tests before and after a biodegradation step. Toxicity test endpoint responses are first transformed to toxic units. The product of effluent toxicity and effluent flow (m3/h) gives the toxic loading value. The log 10 value of an effluent s toxic loading corresponds to its PEEP index. In order to rank the effluents a toxicity classification scale is generated (Tab. 11). 

More traditional acid and base regeneration steps were tested for this high-capacity resin. The column of sorbent XUS 40285 was loaded with succinic acid at 35 g/L and extracted with 1M HC1. Eighty-one percent of the succinic acid was recovered however, there was no increased concentration of the succinic acid in the final product stream. The recovered product stream must be at least as concentrated as the fermentation broth and should be significantly concentrated. 

Step 1 Put ChemStation into Advanced" mode. Load test assay method (select File," select Load Method," select testjassay.m" from TEST METHOD directory on the test server, select OK ). Step 1 None for setup Step 1 Not applicable for setup... 

Step 3 Load Test Sample CSS05." Step 3 None for setup Step 3 Not applicable for setup... 

The rheological behavior of these materials is still far from being fully understood but relationships between their rheology and the degree of exfoliation of the nanoparticles have been reported [73]. An increase in the steady shear flow viscosity with the clay content has been reported for most systems [62, 74], while in some cases, viscosity decreases with low clay loading [46, 75]. Another important characteristic of exfoliated nanocomposites is the loss of the complex viscosity Newtonian plateau in oscillatory shear flow [76-80]. Transient experiments have also been used to study the rheological response of polymer nanocomposites. The degree of exfoliation is associated with the amplitude of stress overshoots in start-up experiment [81]. Two main modes of relaxation have been observed in the stress relaxation (step shear) test, namely, a fast mode associated with the polymer matrix and a slow mode associated with the polymer-clay network [60]. The presence of a clay-polymer network has also been evidenced by Cole-Cole plots [82]. 

Three low load tests with the point load applied at the mid-span of the beam were carried out. In the first two tests, the load was increased in 2 kN steps up to 16 kN and then unloaded in 2 kN steps. The instrumentation was read immediately after the application of each load increment/decrement. In the third test the frame was loaded up to a maximum load of 20 kN. All three tests showed good repeatability and the frame exhibited a linear elastic response. Mid-span deflection and joint rotations recorded in the second test are shown in Figure 3. Details of the load-strain plots for two of the low load and the ultimate load tests are given in reference 5. 

Figure 1-5. Typical creep curve showing the three steps of creep. Curve A, constant-load test curve B, constant-stress...

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