fatigue crack propagation mechanism pdf creator

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Fatigue Crack Propagation Mechanism Pdf Creator

The...cross-linked...chains...lack...the...mobility...to...arrange...into...the...lowest...energy...conformations...provided...by...the...crystals...and...also...the...effective...distance...between...cross-links...is...smaller,...reducing...the...number...of...chain...segments...available...for...crystallization....They....showed....that....radiation....cross-linking....at....100....and....150....kGy....significantly....reduced....the....fatigue....strength....of....UHMWPE,....which....was....reduced....by....another....20%....due....to....subsequent....melting....at....100....kGy....[19,20].The....aims....of....this....study....are....to....investigate....the....separate....effects....of....irradiation....and....subsequent....melting....on....the....mechanical....properties....and....fatigue....resistance....of....UHMWPE....as....a....function....of....radiation....dose....and....to....examine....the....responsible....mechanisms.....Al-Malaika...S....Materials...and...methods2.1....2....Compression....and....tension....fatigue....resistance....of....medical....grade....ultra....high....molecular....weight....polyethylene:....the....effect....of....morphology,....sterilization,....aging....and....temperature.....We....rather....report....a....relative....stiffness....value.2.4.....The...resulting...decreased...crystallinity...adversely...affects...the...mechanical...properties...and...fatigue...strength...[18],...limiting...the...use...of...this...material...in...high-stress...applications...such...as...posterior-stabilized...knees.Others...have...studied...the...effect...of...cross-linking...on...the...mechanical...properties...and...fatigue...behavior...of...UHMWPE....The....yield....strength....(YS)....and....ultimate....tensile....strength....(UTS)....were....calculated.....

There....was....not....a....significant....correlation....between....the....stiffness....and....crystallinity....of....these....test....samples....with....an....r2-....value....of....0.01.The....crystallinity....of....CISM....UHMWPE....was....significantly....less....than....that....of....CI....UHMWPE....at....all....irradiation....doses....from....25....to....100....kGy....(p....0:05,....Table....2).....5).....Biomaterials....The..glass..transition..temperature..of..the..amorphous..UHMWPE..is..well..below..room..temperature;..therefore,..the..mechanical..properties..and..fatigue..strength..of..UHMWPE..depend..directly..on..the..content..of..the..crystalline..domains.Irradiation..and..melting..is..currently..used..to..reduce..adhesive/abrasive..wear..of..UHMWPE..components..in..total..joint..arthroplasty..[6-8]..and..has..largely..replaced..gamma-sterilization..as..a..post-processing..method..of..choice..in..hips...2004:211.21....Malhi,a..and..Orhun..K...Current....trends....and....controversies.....A....better....understanding....of....the....effects....of....radiation....and....subsequent....melting....and....underlying....mechanisms....will....form....a....strong....foundation....in....developing....the....next....generation....highly....cross-linked....UHMWPEs....with....higher....strength....and....higher....fatigue....resistance....than....those....that....are....in....clinical....use....today.....Kurtz...SM,...Rimnac...CM,...Pruitt...L,...Jewett...CW,...Goldberg...V,...Edidin...AA....

Wright....Medical.....In..vivo..UHMWPE..biodegradation..of..retrieved..prosthesis...3...Footnotes#This....study....was....funded....by....NIH....R01....AR051142-01.....4),..where..breakup..was..observed..in..the..direction..of..crack..growth..between..striations...The..pan..was..crimped..with..an..aluminum..cover..and..placed..in..a..Q-1000..DSC..(TA..Instruments,..Newark,..DE)...​(Figs.44...and...​and5)5)...is...attributed...to...the...ability...of...these...materials...to...undergo...large-strain...plastic...deformation...an...indication...of...the...material's...ability...to...dissipate...energy...from...the...crack...tip...and...resist...crack...propagation....

Bhateja...S,...Duerst...R,...Aus...E,...Andrews...E....Luo..Y,..Wang..G,..Lu..Y,..Chen..N,..Jiang..B...Biomaterials...Since...the...substrate...material...is...not...deformed...and...the...surface...is...deformed...to...large...strain...levels,...buckling...is...the...only...way...of...accumulating...these...surface...changes....[PubMed]23.....J..Arthroplasty...recrystallization,....would....lead....to....an....increase....in....the....stiffness;....however,....there....was....no....correlation....between....stiffness....and....crystallinity....of....the....irradiated....test....samples.....Muratoglu..OK,..Kurtz..S...

The..engineering..strain..was..calculated..by..using..the..crosshead..displacement..and..the..engineering..stress..by..normalizing..the..load..with..the..original..cross-sectional..area...The..surface..buckling..observed..along..these..tears..was..likely..a..result..of..the..surface..instability..caused..by..the..localized..large-strain..plastic..defomation...Location..of..radiation-induced..cross-links..and..damage..in..melt-crystallized..polyethylene...The....stiffness....values....reported....were....calculated....from....the....engineering....stress–strain....curve....by....measuring....the....slope....of....the....secant....from....0%....strain....to....2%....strain.....Testing....was....conducted....at....a....sinusoidal....load....cycle....frequency....of....5....Hz....and....a....stress....ratio....of....0.1....in....tension.....The...fracture...surface...was...gold-coated...to...a...thickness...of...100–250...by...a...sputter...coater...(BOC...Edwards...sputter...coater...S150B,...Wilmington,...MA)....The..YS..of..CISM..was..significantly..lower..than..that..of..CI..at..all..radiation..doses..except..at..50..and..75..kGy..(p<0.005)...The..relationship..between..the..clinical..performance..and..large..deformation..mechanical..behavior..of..retrieved..UHMWPE..tibial..inserts...One..major..factor..that..limits..the..long-term..performance..of..total..joints..is..the..bone..resorption..around..the..implants..(peri-prosthetic..osteolysis)..secondary..to..particulate..debris..[2,3],..which..is..primarily..generated..by..the..adhesive/abrasive..wear..of..UHMWPE..[4,5]...[PubMed]8..... 102d75a83e
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