Closure to “Discussion of ‘Fracture Mechanics and Nondestructive Testing of Brittle Materials’” (1972, ASME J. Eng. Ind., 94, pp. 297–298)

1972 ◽  
Vol 94 (1) ◽  
pp. 298-298
Author(s):  
W. G. Clark
Keyword(s):  
Fracture Mechanics ◽  
Nondestructive Testing ◽  
Brittle Materials

Fracture Mechanics and Nondestructive Testing of Brittle Materials

1972 ◽  
Vol 94 (1) ◽  
pp. 291-297 ◽  
Author(s):  
W. G. Clark
Keyword(s):  
Fracture Mechanics ◽  
Nondestructive Testing ◽  
Fracture Behavior ◽  
Brittle Materials ◽  
Orientation Distribution ◽  
Nondestructive Inspection ◽  
Structural Failure ◽  
Practical Engineering ◽  
Basic Concepts ◽  
Defect Morphology

The fracture mechanics approach to the development of meaningful nondestructive inspection requirements is presented. The basic concepts underlying the technology are reviewed and the practical engineering aspects of this approach to the prevention of structural failure are demonstrated. Particular emphasis is placed on evaluating the influence of defect morphology (size, shape, orientation, distribution, etc.) on fracture behavior. A hypothetical inspection problem is included and the pertinent considerations associated with the development of a realistic nondestructive inspection specification are discussed in detail.

Experimental Study on the Failure Criterion for Brittle Materials in Compression

2011 ◽  
Vol 320 ◽  
pp. 259-262
Author(s):  
Xu Ran ◽  
Zhe Ming Zhu ◽  
Hao Tang
Keyword(s):  
Thin Film ◽  
Experimental Study ◽  
Compressive Strength ◽  
Fracture Mechanics ◽  
Failure Criterion ◽  
Brittle Materials ◽  
Experimental Results ◽  
Experiment Study ◽  
Confining Stress ◽  
Theoretical Results

The mechanical behavior of multi-cracks under compression has become a very important project in the field of fracture mechanics and rock mechanics. In this paper, based on the previous theoretical results of the failure criterion for brittle materials under compression, experiment study is implemented. The specimens are square plates and are made of cement, sand and water, and the cracks are made by using a very thin film (0.1 mm). The relations of material compressive strength versus crack spacing and the lateral confining stress are obtained from experimental results. The experimental results agree well with the failure criterion for brittle materials under compression, which indicates that the criterion is effective and applicable.

A History of the Fractography of Brittle Materials

2009 ◽  
Vol 409 ◽  
pp. 1-16 ◽  
Author(s):  
George D. Quinn
Keyword(s):  
Fracture Mechanics ◽  
Failure Analysis ◽  
State Of The Art ◽  
Brittle Materials ◽  
Fractographic Analysis ◽  
Current State ◽  
History Of ◽  
Scientists And Engineers ◽  
Work Done ◽  
Study Of Fracture Surfaces

The evolution of the science of fractography of brittle materials initially was driven by failure analysis problems. Early analyses focused on general patterns of fracture and how they correlated to the loading conditions. Many early documents are simply descriptive, but the curiosity of some key scientists and engineers was aroused. Scientific or engineering explanations for the observed patterns gradually were developed. Advances in microscopy and flaw based theories of strength and fracture mechanics led to dramatic advances in the state of the art of fractographic analysis of brittle materials. Introduction: This author was drawn backwards in time as he researched the current state of the art of fractographic analysis of brittle materials for his fractography guide book.[ ] Others have written about how the fractographic analysis of metals evolved (e.g., [ , , , ]), but there is no analogue for ceramics and glasses. The key scientists, engineers, and analysts who contributed to our field are shown in Fig. 1. Other work done by industry workers who were unable or loathe to publish is now lost, inaccessible, forgotten, or even discarded. It is the goal of this paper to review the key publications and mark the noteworthy advances in the field. Some deem fractography as the study of fracture surfaces, but this author takes a broader view. Fractography is the means and methods for characterizing fractured specimens or components and, for example, a simple examination of the fragments and how they fit together to study the overall breakage pattern is a genuine fractographic analysis.

Fatigue Fracture Mechanics Modeling and Structural Integrity Assessment of Offshore Welded Tubular Joints

1989 ◽  
Vol 111 (3) ◽  
pp. 170-176 ◽  
Author(s):  
J. C. P. Kam ◽  
D. A. Topp ◽  
W. D. Dover
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Fracture Mechanics ◽  
Nondestructive Testing ◽  
Crack Growth ◽  
Large Scale ◽  
Structural Integrity ◽  
Offshore Structures ◽  
Integrity Assessment ◽  
Tubular Joints

Evaluation of the structural integrity of offshore structures requires information on the reliability of nondestructive testing, the accuracy of fatigue crack growth modeling and other data. The University College London Underwater NDE Centre has been set up to provide information on the effectiveness and reliability of different nondestructive testing methods. To achieve this aim, a large library of cracked specimens will be assembled. In the preliminary phase of producing this library, a series of large-scale welded tubular joints were fatigue tested and the crack growth was fully monitored with the ACPD technique. This paper will describe briefly the background to the crack library and present the data obtained from fatigue tests. It will also describe a new model for fatigue crack growth prediction in tubular joints using fracture mechanics. This model allows the prediction of the size effect noted previously in the stress/life curves for tubular joints.

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