Online Acoustic Emission Monitoring of Cyclic Ball Indentation Testing - Correlation with Hysteresis Area Response

Prakash, Raghu V.; Thomas, Merin; Prakash, Anirudh R.; Mukhopadhyay, C. K.

doi:10.1016/j.prostr.2020.10.134

Cited by 1 publication

(4 citation statements)

References 7 publications

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“…A round robin experiment was performed for small CT specimens, it was discovered to be a robust technique, suitable to evaluate fracture toughness using the Master curve approach, with the distribution of the fracture toughness values being the same as for standard tests. 166 Considering the size effects for 3-point-bending specimens (Figure 20): in some cases the size effect was observed 136,162 and in some cases it Prakash and Subbiah 61 and Wang and Zhang 130 Lewis et al 84 and Prakash et al 107 Lancaster et al 83 and Lewis et al 84 was not. 139,143,208 Similar observations were made for sub-size Charpy specimens.…”

Section: Fracture Toughnessmentioning

confidence: 99%

“…106,107 Evaluating when exactly failure occurs is difficult in post-processing, therefore acoustic emission should be used instead. 107…”

Section: Fatigue Testingmentioning

confidence: 99%

“…83,84 Cyclic ABI (constant load amplitude) testing is a promising technique for evaluating fatigue life, but, similarly to small punch fatigue testing, there currently is no way to convert the cyclic ABI life data to standard life data. 106,107 Evaluating when exactly failure occurs is difficult in post-processing, therefore acoustic emission should be used instead. 107 Overall small specimens are capable of determining fatigue life.…”

Section: General Fatigue Life Estimationmentioning

confidence: 99%

“…106,107 Evaluating when exactly failure occurs is difficult in post-processing, therefore acoustic emission should be used instead. 107 Overall small specimens are capable of determining fatigue life. The main challenges with small specimen fatigue testing are the inconsistent size effects for certain geometries, difficult application of reversible loading and complicated methods required to interpret data.…”

Section: General Fatigue Life Estimationmentioning

confidence: 99%

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Small specimen techniques for estimation of tensile, fatigue, fracture and crack propagation material model parameters

Kazakeviciute

Rouse

Focatiis

et al. 2021

The Journal of Strain Analysis for Engineering Design

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Small specimen mechanical testing is an exciting and rapidly developing field in which fundamental deformation behaviours can be observed from experiments performed on comparatively small amounts of material. These methods are particularly useful when there is limited source material to facilitate a sufficient number of standard specimen tests, if any at all. Such situations include the development of new materials or when performing routine maintenance/inspection studies of in-service components, requiring that material conditions are updated with service exposure. The potentially more challenging loading conditions and complex stress states experienced by small specimens, in comparison with standard specimen geometries, has led to a tendency for these methods to be used in ranking studies rather than for fundamental material parameter determination. Classifying a specimen as ‘small’ can be subjective, and in the present work the focus is to review testing methods that utilise specimens with characteristic dimensions of less than 50 mm. By doing this, observations made here will be relevant to industrial service monitoring problems, wherein small samples of material are extracted and tested from operational components in such a way that structural integrity is not compromised. Whilst recently the majority of small specimen test techniques development have focused on the determination of creep behaviour/properties as well as sub-size tensile testing, attention is given here to small specimen testing methods for determining specific tensile, fatigue, fracture and crack growth properties. These areas are currently underrepresented in published reviews. The suitability of specimens and methods is discussed here, along with associated advantages and disadvantages.

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