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PV limit

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Published: 31 December 2017
Fig. 11 The range of PV limited by minimum and maximum values of the friction coefficient More
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Published: 31 December 2017
Fig. 26 Diagram of the pressure/velocity ( PV ) upper limit More
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003030
EISBN: 978-1-62708-200-6
... for an application or to investigate a particular wear process. It describes the wear tests conducted with/without abrasives and explains the concept of PV limit (where P is contact pressure and V is velocity). The article concludes with references and tables of friction and wear test data for polymeric materials...
Image
Published: 01 November 1995
Fig. 7 Schematic representation of friction, interface temperature, and wear rate changes during the determination of PV limit by (a) constant velocity and incremental load increases or (b) wear rate vs. load at constant velocity. Source: Ref 7 More
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006398
EISBN: 978-1-62708-192-4
... factor will be correspondingly limited. Most plastic bearing materials are sensitive to PV because of their low thermal conductivities and high thermal expansion rates. Fig. 4 Schematic showing parameters that affect frictional heat dissipated by conduction. Q , heat generated by friction...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006380
EISBN: 978-1-62708-192-4
... wear. A linear period follows the break-in. Source: Ref 1 A second figure of merit often used in connection with polymers (and bearing bushings) is a descriptor of the rubbing severity above which severe or catastrophic wear sets in. This parameter is called the PV limit, where P...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006373
EISBN: 978-1-62708-192-4
...] or the limit of admissible wear) is a function of a combination of test parameters ( Fig. 10 ). This type of data presentation is convenient for design engineers, providing the necessary range of data to fix the limit load and velocity in a given friction unit. Fig. 10 Plot of pressure-velocity ( PV...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006641
EISBN: 978-1-62708-213-6
... concentrations in a single run. A detection limit of <1 ppt (pg/g or pg/mL) can be readily and routinely achieved for most elements. To minimize contamination levels and reduce quality fluctuation, analysis of UPW for trace and ultratrace elements has been used routinely in semiconductor and photovoltaic (PV...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005708
EISBN: 978-1-62708-171-9
... (PVs) in particular that are exhibiting extraordinary recent growth. The global production and markets more than doubled in 2010. An estimated 17 GW of capacity was added worldwide (compared with just under 7.3 GW in 2009), bringing the global total to approximately 40 GW—more than seven times...
Series: ASM Handbook
Volume: 2B
Publisher: ASM International
Published: 15 June 2019
DOI: 10.31399/asm.hb.v02b.a0006590
EISBN: 978-1-62708-210-5
... of solid aluminum bearings when expansion is controlled by iron or steel supporting members. Aluminum bearings, depending on the application, run with pressure-times-velocity (pv) values from 10,000 to 750,000. They withstand very high speeds, as evidenced by successful tests conducted at a surface...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003572
EISBN: 978-1-62708-180-1
... Neat and short fiber reinforced composites (SFRP) Seals, gears, slideways bearings, and abrasive wear applications PV < 15 MPa · m/s V < 5 m/s, μ > 0.03 T < 250 °C, W S > 10 −16 m 3 /Nm Continuous fiber reinforced composites (UD) Under-water or high temperature...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001070
EISBN: 978-1-62708-162-7
... of shaft surface velocity, V , times specific bearing load, P , the so-called PV factor, is a useful parameter for describing bearing performance. Strictly speaking, the concept of a permissible or maximum PV value means that a bearing should operate under the hydrodynamic (lowest friction) mode...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003612
EISBN: 978-1-62708-182-5
... of Growth of Corrosion Pits , Critical Factors in Localized Corrosion II , Vol PV 95-15 , Natishan P.M. , Kelly R.J. , Frankel G.S. , and Newman R.C. , Ed., The Electrochemical Society , 1995 , p 1 5. Beck T.R. and Alkire R.C. , J. Electrochem. Soc. , Vol 126...
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001035
EISBN: 978-1-62708-161-0
...) 0.048 (a) 0.058 (a) … … … … SA-106B K01700 C-Si Seamless carbon steel pipe 0.30 (a) 0.29–1.06 0.10 (b) 0.048 (a) 0.058 (a) … … … … SA-285A K03006 C Carbon steel PV plate 0.17 (a) 0.90 (a) … 0.035 (a) 0.045 (a) … … … 0.25 Cu (a) SA-299 K02803 C-Mn-Si C...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.9781627081924
EISBN: 978-1-62708-192-4
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003595
EISBN: 978-1-62708-182-5
...., Proc. vol PV 2000-30, Electrochemical Society , Pennington , 2002 • Edwards J. , The Mechanism of Electropolishing of Copper in Phosphoric Acid Solution , J. Electrochem. Soc. , 1953 , p 223C 10.1149/1.2781129 • Piotrowski O. , Madore C. , and Landolt D...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001809
EISBN: 978-1-62708-180-1
... with a low contact pressure, p , and at a low speed, V. A recommended pV limit is 0.2 MPa · m/s ( Ref 1 ). Another is to lay a thin film of polymer on a metal backing to increase the heat-flow rate. A third is to fill the polymer with a material that has high thermal conductivity. The third solution...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004124
EISBN: 978-1-62708-184-9
... be distinguished from high-pH conditions by considering the boiler water chemistry. A low-pH condition can be created when the boiler is operated outside of normal recommended water chemistry parameter limits. This is caused by contamination such as: (a) condenser in-leakage (e.g., seawater or recirculating...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003555
EISBN: 978-1-62708-180-1
... generally are more complex and have lower melting temperatures than the corresponding oxides ( Ref 6 ). Adding chromium improves resistance to sulfide attack and increases the temperature limit in a sulfidizing environment. Chromium sulfide formed below the surface of the protective oxide layer may lead...
Book Chapter

Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001369
EISBN: 978-1-62708-173-3
... is capable of being employed both with the drop-bottom (discretely pumped) EBW-MV unit and the sliding-seal (continuously pumped) EBW-MV unit. Fig. 7 Schematic showing a cutaway view of a dial table device incorporated into an EBW-(MV/PV) system to provide indexing of work station into welding area...