When the elastomer sustains the shock load or the blast load, its internal stress state of every point will change rapidly over time. Dynamic photoelasticity method is an experimental stress analysis method, which researches the dynamic stress and the stress wave propagation. Light source is one of very important device in dynamic photoelastic experiment system, and the RGB laser light source applied in dynamic photoelastic experiment system is innovative and evolutive to the system. RGB laser is synthesized by red laser, green laser and blue laser, either as a single wavelength laser light source, also as synthesized white laser light source. RGB laser as a light source for dynamic photoelastic experiment system, the colored isochromatic can be captured in dynamic photoelastic experiment, and even the black zero-level stripe can be collected, and the isoclinics can also be collected, which conducively analysis and study of transient stress and stress wave propagation. RGB laser is highly stable and continuous output, and its power can be adjusted. The three wavelengths laser can be synthesized by different power ratio. RGB laser light source used in dynamic photoelastic experiment has overcome a number of deficiencies and shortcomings of other light sources, and simplifies dynamic photoelastic experiment, which has achieved good results.
A new kind dynamic photoelastic system is constructed which includes high-speed photography system and digital
image processing system. The dynamic photo elasticity system catches the force process of different epoxy resin
specimens under static load and impact load in circularly polarized. It was a sample to use high-speed camera to study
the process of the material internal stress transmission under impact load. The photos were caught in the force process to
study and analyze the movement and law of isochromatic fringe pattern. The stress's values of Integer fringes in the
force process were counted. After finished the experiment, we discussed the feasibility to improve the lamp-house,
image resolution and the time of exposure.
The mutual transformation of Martensite and Austensite and propagation of their interface are studied with the fourbeam
moire interferometry during the process of loading of polycrystalline NiTi shape memory alloys (SMA). The
distribution of Austensite and Martensite and the extension nearby the interface is observed from the moire photographs
when the specimen is transformed.
PFM has the advantages of real color and anti-milled, widely be used in restoration of teeth destroyed, teeth incomplete
and teeth beauty. However, due to the issue of brittleness of ceramics and its manufacturing technology, the case of lost
ceramics, crack inside and interface separate often occurs in clinical. In this regard, it not only delay the restoration, but
also greatly add the expense of restoration. Hence, a inspection method is required to develop, in order to judge whether
there is flaw on the PFM teeth cover or inside or not both before and after restoration. This paper will adopt Scanning
Acoustic Microscope and X-Ray Microscope Inspection to conduct the Nondestructive testing for PFM restoration. The
results show that the above two methods are both feasible on flaw inspection. Especially, the combination of two
methods could effectively inspect the flaw's depth and size on PFM cover or inside, this will provide widely application
for clinical in the future.
We present a new, high-accuracy digital image correlation measurement system based on a double long-focus CCD microscope. This has many advantages, such as noncontact measurement, high accuracy, quasi real time, and convenient operation. It can be used in the measurement of strain (especially in strain measurement of flexible high-molecular synthetic material, where the strain measured is averaged data) and linear expansibility of new material that has low expansibility. It can measure strain that is less than 1 µ when it is used in strain measurement. The conventional digital image correlation technology can measure strain that should be more than 20 µ. An array optical element is used to set the mark of 0.05 mm. The time-average method is used to eliminate CCD noise and bad effects caused by liberation, so the correlation measurement sensitivity is up to 0.01 pixel. The result of the strain test for metal material is listed. Moreover, we illustrate that the digital image correlation measurement method is the technology of a high-point diffraction resolving ratio in a super optics system.
According to the digital correlation of computer image processing, this paper advances a new high precision and un-touched method for measuring the large range distance by correlation search. In factual application, this method is used for measuring the distance of the CJ6120LC6HK carriage's front and trailing axes centers. This paper presents analysis on the correlation function, measuring precision and measuring error. Based 1m high precision mir, accurate orientation has been given, so that the good results have been gained for measuring the distance of the CJ6120LC6HK carriage's front and trailing axes centers. In conclusion, a good method for measuring the large range distance could give the revelation to the engineering application.
The inter-vertebra disc is an important part of human lumbar spine, it is valuable to examine the lumbar spine and inter- vertebra disc by means of bio-mechanics. A new testing method is described in this paper for inner stress measuring, the test data is verified by the other test method, which is satisfying, which is satisfying. The results of this paper establish the foundation of the inter-vertebra disc core study, and it is helpful in the clinic and practical application.
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