Search results
Results from the WOW.Com Content Network
Ozone attack will occur at the most sensitive zones in a seal, especially sharp corners where the strain is greatest when the seal is flexing in use. The corners represent stress concentrations, so the tension is at a maximum when the diaphragm of the seal is bent under air pressure. Close-up of ozone crack (using ESEM) in NBR diaphragm seal
Environmental scanning electron microscope image of ozone cracks in NBR diaphragm seal formed at sharp corners in seal. Diaphragm seals are susceptible to failure via several mechanisms, including cracking. Ozone cracking can occur in many elastomers for example used in pneumatic systems. If the gas contaminates the air supply, then many rubber ...
The specimen is placed on the work table and a notch is created exactly at the centre. The crack should be generated such that the defect length is about half the depth. The load applied on the specimen is generally a three-point bending load. A type of strain gauge called a crack-mouth clip gage is used to measure the crack opening. [3]
Fracture mechanics is the field of mechanics concerned with the study of the propagation of cracks in materials. It uses methods of analytical solid mechanics to calculate the driving force on a crack and those of experimental solid mechanics to characterize the material's resistance to fracture.
A common form of crevice failure occurs due to stress corrosion cracking, where a crack or cracks develop from the base of the crevice where the stress concentration is greatest. This was the root cause of the fall of the Silver Bridge over the Ohio River , in 1967 in West Virginia , where a single critical crack only about 3 mm long suddenly ...
The NFL power rankings for Week 16 feature a rare reshuffling at the top, as the Lions' fall leaves the No. 1 spot open for another team to seize.
It is a deformable material that is used to create a static seal and maintain that seal under various operating conditions in a mechanical assembly. [1] Gaskets allow for "less-than-perfect" mating surfaces on machine parts where they can fill irregularities. Gaskets are commonly produced by cutting from sheet materials.
A Canadian man has been arrested by Indian authorities at New Delhi’s airport after a crocodile skull was found in his luggage. The 32-year-old man, who was not named by authorities, was on his ...