Plastics. Determination of fracture toughness (G$dI$dC and K$dI$dC) at moderately high loading rates (1 m/s)

2018 ◽  
Keyword(s):  
Fracture Toughness ◽  
High Loading ◽  
Loading Rates

Determination of Dynamic Fracture Toughness at High Loading Rates

2012 ◽  
Author(s):  
Uwe Mayer
Keyword(s):  
Fracture Toughness ◽  
Elastic Waves ◽  
Crack Arrest ◽  
Dynamic Fracture Toughness ◽  
High Loading ◽  
Dynamic Crack ◽  
Testing Time ◽  
Loading Rates ◽  
Propagation Of Elastic Waves

To determine fracture mechanics values at high loading rates from force and displacement signals requires the influences of inertia and the propagation of elastic waves to be taken into account. This paper shows how measurement technique requirements can be fulfilled for determination of key values for a testing time below 100μs for 1T C(T) specimens. Results using this method are given for specimens of 22 NiMoCr 3 7 steel (A 508 C1.2) from a project on correlation between dynamic crack initiation and crack arrest.

Discussion of a New Experimental Method in Measuring Fracture Toughness Initiation at High Loading Rates by Stress Waves

1982 ◽  
Vol 104 (1) ◽  
pp. 29-35 ◽  
Author(s):  
J. R. Klepaczko
Keyword(s):  
Fracture Toughness ◽  
Experimental Method ◽  
Split Hopkinson Pressure Bar ◽  
Testing Machine ◽  
Fracture Initiation ◽  
High Loading ◽  
Screening Tests ◽  
Hopkinson Pressure Bar ◽  
Loading Rates ◽  
Wide Range

An experimental method is described for measuring the fracture initiation properties of metals and alloys over a wide range of loading rates, which can cover over six orders of magnitude in K˙I (1 MPam s−1 ≤ K˙I ≤ 106 MPam s−1). With some modification of the standard compact tension specimen, a large series of screening tests can be performed in the high loading region at a relatively low cost. At the lower loading rates a standard closed loop testing machine can be used. To evaluate fracture initiation at a very high loading rate, a special arrangement of the split Hopkinson pressure bar has been proposed. Specimens of the same geometry as those used in quasi-static tests are placed between the Hopkinson bars. Since the wedge is attached to the incident bar, and the specimen is backed by the transmitter bar (Fig. 2), the course of specimen loading and fracturing can be exactly monitored by recording the incident, reflected and transmitted longitudinal waves. Using this technique, fracture initiation of the prefatigued specimen has been achieved within ∼ 20 μs after the beginning of specimen loading. The effects of inertia acting on the specimen and an error introduced by friction are both considered. Experiments performed on some aluminum alloys as well as on medium carbon steel revealed a complicated pattern of the fracture toughness behavior. Generally, for the strain rate sensitive materials a substantial decrease in fracture toughness was observed under high loading rates.

Determination of the Critical Value of the J-Integral at High Loading Rates Using the Wedge-Loaded Specimen

1985 ◽  
Vol 13 (6) ◽  
pp. 441 ◽  
Author(s):  
AS Kleinberg ◽  
B Grugan ◽  
K Greene ◽  
B Benzing ◽  
JR Schroeder ◽  
...  
Keyword(s):  
Critical Value ◽  
High Loading ◽  
J Integral ◽  
Loading Rates

scholarly journals Dynamic shear fracture toughness and failure characteristics of Ti–6Al–4V alloy under high loading rates

2021 ◽  
Vol 154 ◽  
pp. 103718
Author(s):  
Zejian Xu ◽  
Yang Han ◽  
Changzeng Fan ◽  
Xiaodong He ◽  
P.J. Tan ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Shear Fracture ◽  
High Loading ◽  
Dynamic Shear ◽  
Failure Characteristics ◽  
Loading Rates
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