ASTM G40-2010 Standard Terminology Relating to Wear and Erosion.pdf
《ASTM G40-2010 Standard Terminology Relating to Wear and Erosion.pdf》由会员分享,可在线阅读,更多相关《ASTM G40-2010 Standard Terminology Relating to Wear and Erosion.pdf(8页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: G40 10Standard Terminology Relating toWear and Erosion1This standard is issued under the fixed designation G40; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates
2、 the year of last reapproval.Asuperscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 The terms and their definitions given herein representterminology relating to wear and erosion of solid bodies due tomechanical interactions such as occur with cavitati
3、on, im-pingement by liquid jets or drops or by solid particles, orrelative motion against contacting solid surfaces or fluids. Thisscope interfaces with but generally excludes those processeswhere material loss is wholly or principally due to chemicalaction and other related technical fields as, for
4、 instance,lubrication.1.2 This terminology is not exhaustive; the absence of anyparticular term from this collection does not necessarily implythat its use within this scope is discouraged. However, theterms given herein are the recommended terms for the conceptsthey represent unless otherwise noted
5、.1.3 Certain general terms and definitions may be restrictedand interpreted, if necessary, to make them particularly appli-cable to the scope as defined herein.1.4 The purpose of this terminology is to encourage unifor-mity and accuracy in the description of test methods anddevices and in the report
6、ing of test results in relation to wearand erosion.NOTE 1All terms are listed alphabetically. When a subsidiary term isdefined in conjunction with the definition of a more generic term, analphabetically-listed cross-reference is provided.2. Referenced Documents2.1 ASTM Standards:2C242 Terminology of
7、 Ceramic Whitewares and RelatedProducts3. Terminologyabrasive wear, nwear due to hard particles or hard protu-berances forced against and moving along a solid surface.abrasion-corrosion, na synergistic process involving bothabrasive wear and corrosion in which each of these processesis affected by t
8、he simultaneous action of the other and, inmany cases, is thereby accelerated.abrasivity, nthe ability of a material or substance to causeabrasive wear.absolute impact velocity See impact velocity.acceleration period, n in cavitation and liquid impingementerosion, the stage following the incubation
9、period duringwhich the erosion rate increases from near zero to amaximum value. (See also erosion rate-time pattern.)accumulation period, n in cavitation and liquid impinge-ment erosion, a less-preferred term for acceleration period.adhesive wear, nwear due to localized bonding betweencontacting sol
10、id surfaces leading to material transfer be-tween the two surfaces or loss from either surface.angle of attack, nin impingement erosion, the angle betweenthe direction of motion of an impinging liquid or solidparticle and the tangent to the surface at the point of impact.angle of incidence, nin impi
11、ngement erosion, the anglebetween the direction of motion of an impinging liquid orsolid particle and the normal to the surface at the point ofimpact.apparent area of contact, nin tribology, the area of contactbetween two solid surfaces defined by the boundaries of theirmacroscopic interface. (Contr
12、ast with real area of contact.)asperity, nin tribology, a protuberance in the small-scaletopographical irregularities of a solid surface.attenuation period, n in cavitation and liquid impingementerosion, a less-preferred term for deceleration period.average erosion rate, na less preferred term for c
13、umulativeerosion rate.Beilby layer, nan altered surface layer of supposedly amor-phous material formed on a crystalline solid during mechani-cal polishing, whose existence was proposed in Sir GeorgeBeilbys writings. The existence of such a layer is notsupported by recent research, and the use of thi
14、s term istherefore considered archaic and is strongly discouraged.break-in, nSee run-in.break in, vSee run in.brinelling, ndamage to a solid bearing surface characterizedby one or more plastically formed indentations caused bystatic or impulsive overloads, especially as found in rollingcontact beari
15、ngs. (See also false brinelling.)1This terminology is under the jurisdiction of ASTM Committee G02 on Wearand Erosion and is the direct responsibility of Subcommittee G02.91 on Terminol-ogy.Current edition approved Jan. 1, 2010. Published February 2010. Originallyapproved in 1973. Last previous edit
16、ion approved in 2009 as G4009. DOI:10.1520/G0040-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyrigh
17、t ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.brittle erosion behavior, nerosion behavior having charac-teristic properties that can be associated with brittle fractureof the exposed surface; that is, little or no plastic flow occurs,but cr
18、acks form that eventually intersect to create erosionfragments. (See also ductile erosion behavior.)DISCUSSIONIn solid impingement an easily observable aspect oferosion helps to distinguish brittle from ductile behavior. This is themanner in which volume removal varies with the angle of attack. With
19、brittle erosion the maximum volume removal occurs at an angle near90, in contrast to approximately 25 for ductile erosion behavior.carrier fluid, n in impingement or slurry erosion, fluidmedium that transports impinging solid or liquid particlesand that gives the particles their momentum relative to
20、 thesolid surface on which they are impinging.catastrophic period, n in cavitation or liquid impingementerosion, a stage during which the erosion rate increases sodrastically that continued exposure threatens or causes grossdisintegration of the exposed surface. This stage is notinevitable; it is ob
21、served most commonly with some brittlematerials. When it does occur, it may begin during any stageof the more common erosion rate-time pattern.catastrophic wear, nrapidly occurring or accelerating sur-face damage, deterioration, or change of shape caused bywear to such a degree that the service life
22、 of a part isappreciably shortened or its function is destroyed.cavitating disk device (or apparatus), na flow cavitationtest device in which cavitating wakes are produced by holesin, or protuberances on, a disk rotating within a liquid-filledchamber. Erosion test specimens are attached flush with t
23、hesurface of the disk, at the location where the bubbles arepresumed to collapse.cavitating jet, na continuous liquid jet (sometimes sub-merged) in which cavitation is induced by the nozzle design,or sometimes by an obstruction placed in the center of theflow passage.cavitating wake, n See flow cavi
24、tation.cavitation, n, nthe formation and subsequent collapse,within a liquid, of cavities or bubbles that contain vapor orgas or both.DISCUSSIONCavitation originates from a local decrease in hydro-static pressure in the liquid, usually produced by motion of the liquid(see flow cavitation) or of a so
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
本资源只提供5页预览,全部文档请下载后查看!喜欢就下载吧,查找使用更方便
5000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMG402010STANDARDTERMINOLOGYRELATINGTOWEARANDEROSIONPDF
链接地址:http://www.mydoc123.com/p-540615.html