Advances in Material Property Characterization using Small Punch Tests

The present book compiles research work to convert load-displacement data of small-punch tests to material properties in Small Punch Tests. It calculates J-R data of aged materials employing experimental data of pre-cracked miniaturized specimens. Application of cohesive-zone finite element to model semi-brittle SPT specimens is explained.

The small punch test (SPT) is useful to calculate changes in the tensile and fracture properties of structural materials during the service life of the materials of plant components. This book compiles advances in the development of correlations to calculate mechanical properties of the materials using SPT data. New correlations have been developed using hybrid methodology involving analytical and experimental data. The newly developed correlations have been tested conducting case studies on SPT and pre- cracked/ notched SPT (p- SPT) specimens. The eventual applications of all the new correlations have been demonstrated by conducting a real- life case study involving degradation of structural material from ductile to semi- brittle state due to aging.

Features:

• Presents exclusive material on the remnant life assessment of in- service materials using SPTs.

• Assesses the fracture toughness of ductile materials using the experimentally measured biaxial fracture strain.

• Provides new equations to calculate the yield and ultimate stresses of copper and titanium alloys using measured SPT data.

• Explores functions to correlate the load- displacement data of p- SPT specimens with fracture properties.

• Includes case studies with direct relevance to the degradation of plant materials.

This book is aimed at researchers, professionals, and graduate students in materials science and engineering, mechanical property characterization and testing, and small- scale experimentation. It is expected that the advanced methodology presented in this book to evaluate changes in the properties of aged materials during the service life using SPT data are useful to designers for safety evaluation and also to calculate the remaining service life of industrial components for life extension studies.

Autorentext

B.K. Dutta, Bachelor of Engineering (National Institute of Technology, Raipur), Master of Technology (Indian Institute of Technology, Kanpur), Doctor of Philosophy (Indian Institute of Technology, Bombay), served at the Department of Atomic Energy during the period Aug 1977Dec 2018. Subsequently, he was associated with departmental programs as a Raja Ramanna Fellow and Academic Consultant during the period Jan 2019 Jul 2023. As a Distinguished Scientist, Head Human Resource Development Division (Bhabha Atomic Research Centre BARC), and Dean (Homi Bhabha National Institute HBNI), he served the department as a researcher, academician, and engineering practitioner. The primary thrust of Dr. Dutta's research is linked to the structural safety of Indian nuclear reactors.

Inhalt

1. Introduction 2. Present State of Literature on Small-Punch-Test Methodology 3. A Methodology to Develop New Correlations to Calculate Yield and Ultimate Stresses of Engineering Materials using Small Punch Test Data 4. An Improved Correlation between Punch Displacement and Minimum Thickness of SPT Specimen during Test 5. A Generalized Correlation to Ascertain Material Fracture Toughness using Experimental Data of SPT Specimen 6. Development of _pl Function and m-Factor of p-SPT Specimens 7. A New Methodology to Calculate J-R Curve of Structural Steels using p-SPT Data 8. Determination of Mechanical Properties of Degraded Engineering Material using SPT Data: A Real-Life Case Study