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Koncepcja układu badawczego do wykonywania testów Hopkinsona w obniżonych temperaturach

Modrzejewski P.

Przegląd Mechaniczny

2018

nr 9

37--39

W artykule dokonano przeglądu różnych rozwiązań technicznych umożliwiających wykonywanie testów wytrzymałościowych w obniżonych temperaturach (min. –60°C) za pomocą techniki dzielonego pręta Hopkinsona (SHPB). W pracy przeanalizowano problem zapewnienia stałej temperatury w próbce oraz metody chłodzenia próbek materiałowych. W efekcie sformułowano założenia konstrukcyjne dla układu chłodzącego, sterującego oraz akwizycji danych, na podstawie których opracowano koncepcję rozwiązania konstrukcyjnego komory chłodzącej przystosowanej do stanowiska SHPB.

The article presents a review of various technical solutions allowing to perform strength tests at low temperatures (at least –60°C) using the Split Hopkinson Pressure Bar technique (SHPB). In this paper, the problem of ensuring a constant temperature in the sample and methods of cooling the material samples were analyzed. As a result, the design assumptions for the cooling, control and data acquisition systems were formulated. These assumptions were used to develop the concept (draft design) of a structural solution for a cooling chamber adapted to SHPB.

An experimental study on rate sensitivity of J-integral and its evaluation by small punch test for TRIP steel

Shi L., Iwamoto T., Hashimoto Sh.

Engineering Transactions

2013

Vol. 61, iss. 2

119--136

Recently, much attention has been paid to TRIP steel since it indicates both high ductility and strength by strain induced martensitic transformation. This transformation allows TRIP steel to oﬀer larger energy absorption than other steel at the same strength level. Therefore, it is expected to be applied to automobiles as security components that absorb energy upon collision. To produce the best performance of TRIP steel, the J-integral of TRIP steel should be investigated with respect to a various deformation rates for an evaluation of energy absorption. In the present study, the three point bending (3B) test is conducted for investigating the Jintegral until the crack growth of TRIP steel. Then, in order to determine the energy absorption characteristic by the J-integral value at various locations in the components of TRIP steel, the size of the specimen should be very small. Thus, an SP test is introduced and conducted by using the newly established apparatus based on the SHPB method. By using the result of the SP test in conjunction with the result of a 3B test, the evaluation of the J-integral of TRIP steel subject to various deﬂection rates is attempted. The correlation between the J-integral and the equivalent fracture strain of the SP test for TRIP steel is challenged to be redeﬁned.