{"id":3722,"date":"2021-11-29T16:59:28","date_gmt":"2021-11-29T16:59:28","guid":{"rendered":"https:\/\/tribologie-mannheim.de\/equipment\/mtm2\/"},"modified":"2024-02-01T08:50:51","modified_gmt":"2024-02-01T08:50:51","slug":"mtm2","status":"publish","type":"page","link":"https:\/\/tribologie-mannheim.de\/en\/equipment\/mtm2\/","title":{"rendered":"MTM2"},"content":{"rendered":"\t\t
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Mini-Traction-Machine (MTM2)<\/h2>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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The MTM2 test rig from PCS Instruments is a ball-on-disc test rig that is used to investigate the friction of lubricated and non-lubricated rolling element pairings.<\/p>\n

Ball and disc are driven separately, creating variable slip. As standard, a polished 100Cr6 ball is used as the upper test specimen (D 19.05 mm). With adapters, however, O-rings or similar geometries made of other materials can also be used<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Test bench parameters<\/strong><\/span><\/td>\n <\/td>\n<\/tr>\n
Frictional force range<\/td>\n0 – 10 N<\/td>\n<\/tr>\n
Normal force<\/td>\n5 to 75 N<\/td>\n<\/tr>\n
Contact pressure<\/td>\n520 MPa – 1250 MPa (standard ball)
up to 3.1 GPa (alternative geometries)<\/td>\n<\/tr>\n
Temperature<\/td>\nRT up to 150\u00b0 C<\/td>\n<\/tr>\n
Type of movement<\/td>\nRolling (rollers with variable sliding component)<\/td>\n<\/tr>\n
Friction conditions<\/td>\nRolling friction<\/td>\n<\/tr>\n
Speed<\/td>\nup to +\/- 4 ms-1<\/td>\n<\/tr>\n
Lubricants<\/td>\nOil, grease initial lubrication<\/td>\n<\/tr>\n
Measured variables<\/td>\nWear, normal force, friction force <\/td>\n<\/tr>\n
Test specimen<\/td>\nBall, O-ring, cylinder<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Testing of wheel\/rail lubricants<\/strong><\/p>\n

The method described in CEN\/TS 15427-2-2:2023 – TC for investigating the friction and wear behavior of wheel flange and railhead lubricants (Top-of-the-rail – ToR) is relatively new. A precisely defined quantity of grease is applied to the base disk. After a run-in program, slip ratios in the range 0.25 to 10% are then run at three speeds (50 mm\/s, 1000 mm\/s and 3800 mm\/s).<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Adhesion diagram (below) Adhesion coefficient as a function of the slip – roll ratio (SRR)<\/strong><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Stribeck diagram (top): Friction value as a function of sliding speed; temperatures from 40\u00b0 C (blue) to 100\u00b0 C (green) in 20\u00b0 increments.<\/strong><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Traction curve (bottom): Coefficient of friction as a function of the slip – roll ratio (SRR)<\/strong><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Possible specimen geometries<\/h4>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

… Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"parent":3505,"menu_order":1,"comment_status":"closed","ping_status":"open","template":"","meta":{"sfsi_plus_gutenberg_text_before_share":"","sfsi_plus_gutenberg_show_text_before_share":"","sfsi_plus_gutenberg_icon_type":"","sfsi_plus_gutenberg_icon_alignemt":"","sfsi_plus_gutenburg_max_per_row":"","footnotes":""},"class_list":["post-3722","page","type-page","status-publish"],"yoast_head":"\nMTM2 - Tribologie Mannheim<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/tribologie-mannheim.de\/en\/equipment\/mtm2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MTM2 - Tribologie Mannheim\" \/>\n<meta property=\"og:description\" content=\"... 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