Dye penetrant inspection

Dye penetrant inspection (DPI)

This article provides answers to the following questions, among others: How is dye penetrant inspection carried out and where is it used?What is the purpose of applying the developer?Which types of cracks...
Fatigue endurance diagram acording to Haigh

Fatigue limit diagram according to Haigh and Smith

Fatigue limit diagrams according to Haigh or Smith show the maximum yieldable stress amplitude as a function of the mean stress. This article provides answers to the following questions, among others: How to...
Types of loads

Destructive material testing & non-destructive testing (NDT)

This article provides answers to the following questions, among others: What type of loads do exist?What is dimensioning?What is the primary purpose of destructive testing?In which cases is non-destructive testing preferable? Materials such...
Test setup for flexural test

Bending flexural test

This article provides answers to the following questions, among others: How does the flexural stress distribution in the cross-section of a specimen subjected to bend loading look like?Where does the maximum bending...
Test setup for Charpy impact test

Charpy impact test

This article provides answers to the following questions, among others: What are the objectives of the "Charpy impact test"?Why does "notch impact energy" represent a measure of the toughness of a test...
Brinell hardness test procedure

Hardness test

This article provides answers to the following questions, among others: How is the hardness of materials defined?On which principles are all hardness testing methods based?Which indenter is used for Brinell hardness testing?What...
Principle of ultrasonic testing

Ultrasonic testing (UT)

This article provides answers to the following questions, among others: What is the measurement principle behind ultrasonic testing?What is the coupling agent used for?How are ultrasound waves generated and received?What is the...
Cupping test

Cupping test

This article provides answers to the following questions, among others: What is the cupping test (according to Erichsen)?What is cold formability? Sheets for deep-drawing applications must have very good cold formability, i.e. they...
Measuring tool for eddy current testing

Eddy current testing (ECT)

This article provides answers to the following questions, among others: How does eddy current testing work?Why are two induction coils often connected against to each other? With eddy current testing, electrically conductive materials...
Brittle fracture and ductile fracture

Tensile test

The tensile test is used to determine material parameters such as strength (yield point, ultimate tensile strength) and toughness (elongation at break)! More information about the tensile test can be found...
Schematic setup for stress-relaxation test

Stress-relaxation test

This article provides answers to the following questions, among others: How is the stress-relaxation test performed?For which applications is the stress-relaxation test of great importance?What is relaxation strength? In the creep rupture test,...