Recent content by will123123

Cracking was not noticed during or immediately after installation of the stud, but was discovered after a short in-service period. It is a cut thread. I am more interested in the appears of the fracture surface shown in the SEM images - it is not typical of ductile overload.

Crack before openinghttps://files.engineering.com/getfile.aspx?folder=9b42b125-9fdd-48c1-bb45-b87414ba00ea&file=crack_higher_mag_2.jpg

Higher maghttps://files.engineering.com/getfile.aspx?folder=8daf7fe9-8a99-4bdf-b4cb-e2cd86901e6f&file=bar_02.tif

SEM imagehttps://files.engineering.com/getfile.aspx?folder=4e201b87-088e-45ca-ad11-a8b318601bd6&file=bar_01.tif

I would be interested to hear comments/ thoughts/ opinions on the attached images of a fracture surface of a 7075 T6 component. The part was machined from a piece of plate and failed in the short transverse direction. It appears to have cleaved at the grain boundaries; I am confident the...

Thank you for your replies. Further testing with more appropriate data logging has confirmed creep. I appreciate the temperature is very high, but the service life of the parts are only of the order of 10 hours. The test specimens are typical uniform gauge length, round fatigue specimens with...

I am currently fatigue testing aluminium 6061 at 250°C. Frequency 25Hz and stress ratio 0.1. The specimens are being tested in the elastic range. The failure mechanism of the samples is not cracking and braking in two, but by yielding and necking in the gauge length area. Initially, I assumed...

If we approach this from a different direction. The structures personnel in my company wishes to obtain some 'toughness' values for range of material. They will not be used for design purposes, but to provide some information on the relative 'robustness' or 'tolerance' of components made from...

Further to my last reply. E399, contains recommended sizes to ensure plane-strain in the specimen, E1820, does not as it no longer covers plane-strain. If my requirement is just to compare the toughness of different materials (SiC particulate reinforced aluminium, with diffrent reinformace...

The intention is to compare the toughness between three different, but similar materials. I am reading through E1820 and E399 and I have to say I am getting lost!!

I am looking to undertake some fracture toughness testing of aluminium metal matrix composites (SiC particulate reinforcement). There are a number of test standards, ie. ASTM E399, ASTM E1820, BS 7448 etc. Have anyone undertaken these tests and are able to advise on the pro and con of each test...

I would be interested in views on the way keenserts should be installed into continuous fibre reinforced composites. Do people believe the locking keys should be used (despite the additional damage caused to the fibres)or should the key be removed and the insert just be bonded into the composite?

Metengr: Thank you for the paper it looks very useful - it will be interesting to compare the parameters I get using this approximation against my fatigue results. Although I would still be interested in getting any advice from anyone with experience with conducting strain fatigue tests.

I am currently looking at some 7075 T6 strain controlled fatigue test data to obtain the following parameters: - Cyclic strain hardening exponent Fatigue strength exponent Fatigue Ductility exponent Cyclic strength coefficient Fatigue strength coefficient Fatigue Ductility coefficient Whilst...

Ceramicguy, Could you advise on suitable surface analysis tools, this is the first time I have dealt with ceramics. I usually work with metals and composites and is those cases, to examine the surface I would usually use SEM and FTIR respectively. Regards Carl W