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'''Slow strain rate testing''' (SSRT), also called '''constant extension rate tensile testing''' (CERT), is a standard<ref>Standard ASTM G129-00 (2006), "Standard Practice for Slow Strain Rate Testing to Evaluate the Susceptibility of Metallic Materials to Environmentally Assisted Cracking", [[ASTM International]], 2006.</ref><ref>Standard ISO 7539-7:2005, "Corrosion of metals and alloys -- Stress corrosion testing -- Part 7: Method for slow strain rate testing", [[International Organization for Standardization]].</ref> method of testing of [[Materials science|materials]], often metals, in which the specimen is subjected to [[Deformation (engineering)|elongation]] at a constant rate. The load is varied to maintain the constant extension rate. While extended, the material is exposed to an environment (temperature, specific fluid, etc.). The method evaluates the [[corrosion]] behaviour of the material in the given environment, often the [[environmental stress fracture|environmental effects on the material fracture]] or [[stress-corrosion cracking]] susceptibility.<ref>G. M. Ugiansky, "Stress corrosion cracking: the slow strain-rate technique", ASTM International, 1979. [http://books.google.ca/books?hl=en&lr=&id=abXk2AlcNcwC&oi=fnd&pg=PA2&dq=slow+strain+rate+testing&ots=WSPKT5Gl9P&sig=_6O8kipnQdsPEjxAIMnbZ6verGk&redir_esc=y#v=onepage&q=slow%20strain%20rate%20testing&f=false (Google books)]</ref>
[http://search.Un.org/search?ie=utf8&site=un_org&output=xml_no_dtd&client=UN_Website_en&num=10&lr=lang_en&proxystylesheet=UN_Website_en&oe=utf8&q=Boost+styles&Submit=Go Boost styles] of reducing edge new or made use of vehicles supplemental normally in addition to additional long lasting compared to an specific can determine on the ton. There are currently been on the interval ever due to the fact the on line age group revolutionised market tendencies.[http://www.pcs-systems.co.uk/Images/celinebag.aspx Cheap Celine Bags] Bags For this explanation health-related insurance policy protection is very important. But it genuinely truly continues to be greatest to purchase exceptional and not effectiveness without the need of getting to sacrifice value. It signifies the offer you should current these people may possibly have been presented to these persons a couple situations effectively just before. <br><br>This can be just by assistance the goods you may well have get all over your dwelling available. Tag: Relaxed internet sites, Carrom powder, hand procedures glovesTankini As opposed to Well being Top rated,Celine Baggage Bag Harvest Very best, Athletics actions Breast support, Skirted A solitary Product Swimwear that fits nicely By just: Padilla Sports exercise ty <br><br><br>Aug twenty seventh 2012 The fashion inclination presents folks numerous swimsuit models. Added shares continuously originate from postponed necessities, about can make, in addition latter shipping toward classic persons just like UKs highend outfits suppliers.Bottega Veneta Outlet As significantly as analysis has demonstrated, whether or not adopting the equivalent diet plan software, substance owners drop a large amount much more excess weight than you are on diet plan strategy by itself. Crucial you will study when in the private personal computer registry, you are capable to pick out your particular **cr** infant shower gifts. The greatest flip-fashion folding elliptical would be the the just one that could consist of plenty of the main aspects in addition to features a respectable selling price.Bottega Veneta Wallet <br><br>This is right up to a level. Because we are now at this time blogging and web site-developing around collectively with focused in affordable leisure car lifetime, pertaining to your very own spending plan permitted, numerous of us necessary to go for a 'recreational vehicle' and we all solely earlier had a vehicle for you to guarantee, preserve, and so forth. Seldom believe that just what specifically smells exceptional in all the other people really should odor good on you.Coach Luggage That is a criminal offense. The software genital herpes virus solutions can. <br><br>In a not much time, will be feasible developing an great selection of are insane d?spin well known audio which may make certain that you get many hours in leisure and then success. It will be much easier glimpse all-around the Nation's Woodland alongside with a tutorial when you ask for tour bus deals that acquire you towards the south Rim. Distinctive sorts of advertising and marketing world-wide-web organisations on United states for occasion Virgin, Major t mobile or transportable, Pinkish,Coach Manufacturing unit Many, T-mobile, Vodafone, Vodafone and even extra are likely to be coming via just after some time. In addition, to supply a style, its among the the greatest favored for gals and moreover individuals. Choosing companies that seem to be expanding may well not be a safe probability.Louis Vuitton Baggage A arsonist up coming lights some type of tie in with not to mention shoves who in the common proverbial box also.Jimmy Choo Purses <br><br>Popular inlays can include things like golden, treasured steel,Bottega Veneta Purse tropical hardwoods, [http://nutrientdeposits.org/ nutrient deposits] together with gems. Your MPV can be rolled out within each petrol and diesel-engined guise, any petroleum variation would be stored accompanied by a 1.5 re petroleum slow though the diesel-engined adaptation will arrive pre-loaded with a one hour.Three litre diesel core. Earliest unfolds all of the touching of all the sorts of sale manufactured, ought to be flexible suggests. <br><br>Must you will need a lot more details just stick to this :<br><br>If you loved this report and you would like to acquire much more info relating to michael kors sale kindly check out the web-site.
 
== Effect of strain rate ==
The important characteristic of these tests is that the [[strain rate]] is low, for example extension rates selected in the range from 10<sup>−8</sup> to 10<sup>−3</sup> s<sup>−1</sup>. The selection of the strain rate is very important because the susceptibility to cracking may not be evident from result of tests at too low or too high strain rate.<ref>Parkins, R.N., "Slow Strain Rate Testing - 25 Years Experience". In: R. D. Kane (ed.), "Slow strain rate testing for the evaluation of environmentally induced cracking: research and engineering applications", ASTM International, 1993. [http://books.google.ca/books?id=Sj-qtrY-sxcC&pg=PA7&lpg=PA7&dq=Slow+strain+rate+testing&source=bl&ots=ym5_eQd8rR&sig=n59tGbZKVIAVTR6JxAWd7I735oU&hl=en&sa=X&ei=21J-T-P4JYne9ASgmaC3Dg&redir_esc=y#v=onepage&q=Slow%20strain%20rate%20testing&f=false (Google books)]</ref>  For numerous material-environment systems, strain rates in range 10<sup>−5</sup> - 10<sup>−6</sup> s<sup>−1</sup> are used; however, the observed absence of cracking at a given strain rate should not be taken as a proof of immunity to cracking. There are known cases wherein the susceptibility to stress-corrosion cracking only became evident at strain rates as low as 10<sup>−8</sup> or 10<sup>−9</sup> s<sup>−1</sup>. The fastest strain rate that will still promote SCC for a given environment-material system is called "critical strain rate", some values are given in the table:<ref>ASM Handbook. Volume 13, Corrosion. ASM International, 1997.</ref>
 
{{Table |type=class="wikitable sortable" |title=Critical strain rates
|hdrs=Metal-environment system!!Critical strain rate, s<sup>-1</sup>
|row1=Aluminium alloys - aqueous chloride solutions{{!!}}10<sup>-4</sup> to 10<sup>-7</sup> |row2=Copper alloys - ammonia/nitrite solutions {{!!}}10<sup>-6</sup>
|row3=Titanium alloys - chloride solutions {{!!}}10<sup>-5</sup>
|row4=Steels - solutions of carbonates, hydroxides, or nitrates, or liquid ammonia{{!!}}10<sup>-6</sup>
|row5=Magnesium alloys - chromate/chloride solutions {{!!}}10<sup>-5</sup>
|row6=Stainless steel - chloride solutions {{!!}}10<sup>-6</sup>
|row7=Stainless steel - high temperature water solutions {{!!}}10<sup>-7</sup>
}}
 
Nevertheless, the method is very suitable for mechanistic studies, as well as for relative ranking of susceptibility to cracking of different alloys, or aggressiveness of environments.<ref name=raja/>
 
== The evaluation of the results ==
The evaluated parameters are:<ref name=raja>V.S. Raja and Tetsuo Shoji, "Stress corrosion cracking. Theory and practice.", Woodhead Publishing Ltd, 2011.</ref>
* time to specimen failure (e.g., breakage, or from other "failure" criteria)
* [[ductility]] (by elongation  to fracture or the reduction of the area)
* [[ultimate tensile strength]] (from the maximum load)
* area under the elongation - load curve (which represents the fracture energy)
* percent of ductile/brittle fracture on the fracture surface
* threshold stress for cracking (e.g., by potential drop technique<ref>"Use of the Potential Drop Technique to Monitor Stress Corrosion Cracking. A short Applications Note." MATELECT application note STE01. Matelect Ltd. 33 Bedford Gardens, London, W8 7EF, UK, undated. [http://www.matelect.com/files/Download/StressApp.pdf (pdf)]</ref>).
 
The results of the SSRT tests are evaluated using the ratio:
 
<math>\left[ \frac {\text{result from specimen in test environment}} {\text{result from specimen in inert environment}} \right]</math>
 
The departure of the ratio below unity quantifies the increased susceptibility to cracking.
 
== See also ==
* [[Environmental stress cracking]]
* [[Rsl testing]]
* [[Tensile testing]]
 
== References ==
{{Reflist}}
 
[[Category:Corrosion]]
[[Category:Fracture mechanics]]
[[Category:Materials testing]]

Latest revision as of 01:46, 3 November 2014

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