Increasing Precision and Confidence Level in Fracture Energy Measurement by Optimizing the Number of Test Replicates for Disk-Shaped Compact Tension Fracture Test (ASTM D7313)

2019 ◽  
Vol 47 (5) ◽  
pp. 20180624
Author(s):  
Mirkat Oshone ◽  
Eshan V. Dave ◽  
Jo E. Sias ◽  
Joseph M. Voels ◽  
Debaroti Ghosh ◽  
...  
Keyword(s):  
Fracture Energy ◽  
Confidence Level ◽  
Compact Tension ◽  
Energy Measurement ◽  
Fracture Test ◽  
Tension Fracture

Evaluation of Fracture Toughness (JIC) Using Single Specimen Fracture Test Augmented by Finite Element Analysis

1983 ◽  
Vol 105 (1) ◽  
pp. 8-12 ◽  
Author(s):  
R. D. Streit
Keyword(s):  
Fracture Toughness ◽  
Crack Length ◽  
Compact Tension ◽  
Test Results ◽  
Single Specimen ◽  
Fracture Test ◽  
Flow Properties ◽  
Element Analysis ◽  
Extension Curve ◽  
Tension Fracture

Fracture toughness is evaluated using the combination of results from a single compact tension fracture test and computationally developed key-curves. The key-curves—a family of load-deflection curves for the test specimen with different length cracks—were developed using the tensile flow properties of the material. By overlaying the experimental test results on these curves the crack length and crack growth during the test can be deduced. The value of J for each crack length is then evaluated from the experimental load-deflection data. The J versus crack extension curve is plotted and JIC evaluated. The method is applied to the evaluation of the toughness of depleted uranium and is shown to substantially reduce the scatter often observed in the J versus Δa data.

Fracture Toughness Behaviour of 316L Stainless Steel Samples Manufactured Through Selective Laser Melting

2018 ◽  
Author(s):  
Catrin M. Davies ◽  
Ruijan Zhou ◽  
Olivia Withnell ◽  
Richard Williams ◽  
Tobias Ronneberg ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Selective Laser Melting ◽  
316L Stainless Steel ◽  
Compact Tension ◽  
Crack Plane ◽  
Laser Melting ◽  
Growth Plane ◽  
Toughness Testing ◽  
Tension Fracture

Selective laser melting (SLM) is a relatively new manufacturing technique which offers many benefits. However the utilisation of SLM manufactured components depends on the assurance of their integrity during operation. Fracture toughness testing (JIC) has been performed on as-built compact tension fracture mechanics samples manufactured in three orthogonal directions. When the crack growth plane was transverse to the interface of the build layers, the fracture toughness values were found to be similar to those manufactured using conventional techniques. However, the fracture toughness is significantly reduced when the crack plane is parallel to the interface of the build layers. Simple heat treatments have been performed on Charpy fracture samples and the resulting impact energy values indicate that the fracture toughness of a component may be improved by heat treatment.

Effect of Machining Process on Stable Crack Growth

2009 ◽  
Author(s):  
Abdel-Hamid I. Mourad ◽  
Aladdin Abu-Assi
Keyword(s):  
Crack Growth ◽  
Stable Crack Growth ◽  
Tensile Tests ◽  
Compact Tension ◽  
Machining Process ◽  
Fracture Test ◽  
Growth Behaviour ◽  
Crack Growth Behaviour ◽  
Normal Specimen ◽  
Fracture Tests

This paper aims to present an experimental evidence of the effect of machining process on stable crack growth behaviour (SCG) through AISI 4340 low alloy steel. Brittle fracture behaviour had been discovered in a batch of compact tension CT specimens, unlike previous batches that had shown ductile (stable crack growth) behaviour. This was unexpected, and indeed, was anomalous. An investigation was thus carried out to understand what processes that have affected the behaviour. Such anomalous brittle behaviour was observed while performing the fracture test on the affected specimen. The load-load displacement (P-ΔLL) curves show that the “normal” specimen exhibiting stable crack growth and the non-linear region, in the anomalous curve of the anomalous specimens, is rather limited. This indicates very limited, if any, stable crack growth. Fracture tests were carried out on CT specimens with different heat treatments to find the cause of this unexpected embrittlement. Microhardness measurements, tensile tests and microscopic (SEM) examination were also carried out and reported. The results suggest that, a great attention is needed during machining process to avoid accidental changes in the properties and to avoid misleading experimental results.

Development of a binder fracture test to determine fracture energy properties

2014 ◽  
Vol 15 (sup1) ◽  
pp. 219-238 ◽  
Author(s):  
Tianying Niu ◽  
Reynaldo Roque ◽  
George A. Lopp
Keyword(s):  
Fracture Energy ◽  
Fracture Test

Notched-Beam Test for Fracture-Energy Measurement

1973 ◽  
Vol 56 (10) ◽  
pp. 550-551 ◽  
Author(s):  
S. D. HARTLINE ◽  
R. C. BRADT ◽  
H. R. BAUMGARTNER ◽  
N. B. ROSEBROOKS
Keyword(s):  
Fracture Energy ◽  
Energy Measurement ◽  
Beam Test

Development of the indirect ring tension fracture test for hot-mix asphalt

2014 ◽  
Vol 15 (sup1) ◽  
pp. 146-171 ◽  
Author(s):  
Alireza Zeinali ◽  
Kamyar C. Mahboub ◽  
Phillip B. Blankenship
Keyword(s):  
Hot Mix Asphalt ◽  
Fracture Test ◽  
Tension Fracture

Challenges Associated With the Quantitative Analysis of Ductile Damage Using X-Ray Computed Tomography

2018 ◽  
Author(s):  
Adam J. Cooper ◽  
Timothy L. Burnett ◽  
Olivia C. G. Tuck ◽  
Andrew H. Sherry
Keyword(s):  
Computed Tomography ◽  
Fracture Surface ◽  
Hot Isostatic Pressing ◽  
Ductile Failure ◽  
Compact Tension ◽  
Ductile Damage ◽  
Fracture Toughness Test ◽  
X Ray ◽  
X Ray Computed ◽  
Tension Fracture

We have recently reported on the mechanistic differences in ductile failure between stainless steel manufactured by hot isostatic pressing (HIP) and forging, from which it was established that the oxygen concentration must be properly controlled. As part of an ongoing investigation into the mechanics of ductile failure in novel HIP materials, X-ray CT has been employed as a tool to quantify and characterize the differences in ductile damage below the fracture surface of failed compact tension fracture toughness test specimens. Herein we report on some of the challenges associated with handling data relative to the fracture surface, which can extend far into the cores under investigation.

ChemInform Abstract: NOTCHED-BEAM TEST FOR FRACTURE-ENERGY MEASUREMENT

1973 ◽  
Vol 4 (51) ◽  
pp. no-no
Author(s):  
S. D. HARTLINE ◽  
R. C. BRADT ◽  
H. R. BAUMGARTNER ◽  
N. B. ROSEBROOKS
Keyword(s):  
Fracture Energy ◽  
Energy Measurement ◽  
Beam Test
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