Notched tensile impact test

The materials and morphological parameters are usually studied as function of test temperature and test speed. The Izod method as function of temperature (9,10) is standard. Also studied is the Charpy impact behavior, both as a function of test temperature and test speed (12). With a notched tensile impact test, both test speed and test temperature can easily be varied (I, 2,13). 

Figure 2. Results of notched tensile impact tests versus displacement for the PA-6-EPR blend (24 vol%, 0.3 pm), for different piston speeds (13).

Figure 6. Results of notched tensile impact tests versus temperature for PA-polybutadiene at lOr3 m/s for different rubber concentrations. Key M, 0 vol% , 15 vol% and A, 30 vol% (2).

Ligament Thickness. The ductile-to-brittle transition as measured in notched Izod, notched Charpy, and notched tensile impact tests is discontinuous and is dependent on both rubber concentration and particle size. These two parameters can be combined into a new morphological parameter that governs the ductile-to-brittle transition. The ligament thickness (interparticular distance), which is a function of rubber concentration and particle size,... 

ITIT instrumented notched tensile-impact test... 

The method of instrumented notched tensile-impact testing is preferably used for elastomeric materials which cannot be tested under other impact-like loading conditions. However, also for thermoplastics, especially thermoplastic films, also the characterization of the fracture behaviour under impact loading can be necessary. Therefore, the following Tables show a summary of available data of fracture mecha-nics tests under impact-like loading conditions for thermoplastics and elastomers. 

Dijkstra, K., Laak, J., and Caymans, R. J. 1994. Nylon-6/rubber blends 6. Notched tensile impact testing of nylon-6/(ethylene- propylene rubber) blends. Polymer 35 315-322. 

The specimens are shown in Fig. 1. In each case, the tests were run over the temperature range from 75 to -320 F. The tensile tests evaluated the effect of only one embrittling service condition—low temperatures. The unnotched tensile impact tests added a second embrittling condition—high strain rate. The notched tensile impact tests and the Charpy keyhole impact tests added the third embrittling service condition—stress concentration. 

All four types of tests were made on the plate material in both the longitudinal and transverse directions. They were also made with the specimens transverse to, and centered on, the welds. In addition, notched tensile impact tests andCharpy keyhole impact tests were made with the notches located in the heat-affected zone next to the welds. Altogether, 14 series of tests were made on each alloy. Each test series covered the temperature range from -320 to 75 F. 

Fig. 7. Notched tensile impact tests of %-in, plate and welds of 5083-H113 and SAE 1034 steel.

NOTCHED TENSILE IMPACT TESTS. The results of the notched tensile impact tests are shown in Fig. 7. In these tests all three embrittling service conditions were combined, i.e., low temperatures, high rate of loading, and stress concentration. 

The Charpy transition temperature zones of the SAE1034 steel plate and the steel weld deposit were about the same as for the notched tensile impact tests. The zones were, however, much more sharply defined. 

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