Many people, seeing the bolt fracture face in Fig.4a will correctly recognise a fatigue failure. (W 251) (1)

Fatigue failure = Falha de/por fadiga

Although hardness levels around 400HV and above are certainly more likely to give interface failure, there appears to no ideal answer, as material thickness and material type can also have an effect.(W 306) (2)

Interface failure = Falha na interface (ligação física ou lógica entre dois sistemas)

Interesting features included the formation of the shear bands in the joint area indicating ductile failure in the thermoplastic interlayer.(W 524) (3)

Ductile failure = Falha dúctil

(1) Reliable technical failure investigation

Richard Pargeter 

TWI Ltd

Chapter from:

Pressure Systems Casebook: Causes and Avoidance of Failures and Defects John Wintle (Editor)

London, Professional Engineering Publishing, 2004.

ISBN: 1860584217.

(2) The resistance spot welding of high and ultra-high strength steels

Steve Westgate CEng, SenMWeldI 

TWI Ltd, UK

Paper presented at the 3rd International Seminar on Advances in Resistance Welding, Berlin 16-17 November 2004.

(3) Polymer coated material (PCM) joining technology for manufacture and repair of dissimilar material structures

R J Wise and K Gosai

Paper presented at International Conference: Joining and Repair of Plastics and Composites, 16 – 17 March 1999, London.