Hysteretic heating of PMMA
A cylinder of PMMA was subjected to cyclic compressive loading. The specimen was monitored with a video camera and an infrared camera. The temperature at the center of the specimen increases steadily during the test until ultimate failure. At this point, the polymer is close to its melting point. (D. Rittel, “An investigation of the heat generated during cyclic loading of two glassy polymers. Part I: experimental”, Mechanics of Materials (2000), Vol. 32 No. 3, 131-147).
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Infrared monitoring of a tensile test
A cast 316 stainless steel was subjected to low strain rate tensile testing. The specimen was monitored with a video camera and an infrared camera. Note the gradual elevation of temperature and its localization towards the end of the test. The failure locus is actually indicated by the infrared record prior to actual failure.
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Experimental observation of one-point impact experiment
Experimental observation of one-point impact experiment. The motion of the impacted Charpy specimen was studied using a high speed Imacon camera (1 million frames per second). The specimen was observed to take-off from the bar at t=80 microseconds after being hit by the stress wave (D. Rittel, A. Pineau, J. Clisson and L. Rota, Experimental Mechanics, 2002).
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Numerical simulation of one-point impact experiment
The transfer of energy between the instrumented bar and the Charpy steel specimen was investigated using a finite element model. Loss of contact was detected at t=73 microseconds, in excellent agreement with the experimental observation of 80 microseconds. (Y. Raitman, Mechanics Project, 2002).
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Dynamic fracture of A508 steel
One point impact experiment of an A508 steel Charpy specimen. The specimen was stress wave loaded at 25m/s at -160C. A cleavage crack propagates from the notch at a high velocity (of the order of 1000 m/s). The sequence of pictures was taken with an Imacon camera. (D. Rittel, A. Pineau, J. Clisson and L. Rota, Experimental Mechanics, 2002).
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Three point bend failure of a polymeric laminate
A PMMA notched beam was made of 4 layers cemented by contact glue.
Three point bend loading until failure was filmed using 1000 frames
per second. The discontinuous crack propagation process is clearly
observed and illustrates the concept of "crack-arrester"
geometry.
(E. Raz and Y. Bendavid, student project in the course Failure of
Materials, 2002).
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FEM study of the dynamic deformation of the Shear Compression Specimen - equivalent strain
The dynamic deformation of a steel Shear Compression Specimen, subjected to a prescribed
velocity of 6.7 m/s was modeled using a finite element commercial code (ANSYS). The movie shows
the total equivalent Von-Mises strain during 150 microseconds, by increments of 2 microseconds.
The deforming gage has been cut longitudinally, at mid-height.
(A. Dorogoy, 2003).
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