Soft contact tribology is at the heart of our feelings perceived as moistness, smoothness and comfort. Although there is no standard definition, the study of friction behavior of low modulus materials could qualify as soft contact tribology. Lately, several studies have highlighted the benefits of soft contact tribology in improving our perception of feelings, through engineering the materials that we touch. Friction (or shear stress) connects the mechanical action like touch with the psychological reaction such as smoothness feeling. A representative friction curve for the soft contacts is given in Figure 1. Few important features in this curve are static friction ...
June 13, 2019ducom
The Role of Bench Top Tribometers in Metal Working Fluids ResearchThere are several manufacturing techniques like bending, deep drawing, drilling, grinding, milling, punching and cutting used for shaping the metals. The productivity of any manufacturing process will depend on the tool life and surface integrity of the finished workpiece. Therefore, metalworking fluids (MWF’s) are used in the process to reduce the tool wear and improve the surface finish of the workpiece. This is due to the performance of MWF’s as lubricants, coolants, and carriers of the wear debris. Figure 1. Images representing different manufacturing processes like cutting and drilling (left to ...
June 5, 2019ducom
Accurate evaluation of friction using Metal Forming Tribometer (MFT)Automotive industry continues to develop cars that are lighter, stronger, and cost effective to manufacture using advanced high strength steels (ex. 22MnB5). Hot stamping is used to manufacture vehicle components by pressing steel blank (Al-Si, Zn-Ni coatings) above 900o C between closed dies (H13 steel) to get the final shape (Figure 1A). It is known that Volvo has approximately 40 % of its vehicle weight made of hot stamped steel. High temperatures cause excessive friction and wear between the workpiece and die tools driven by adhesive, abrasive and oxidative wear (Figure ...
May 9, 2019ducom
Importance of Friction Measurement during ASTM G65 Abrasion TestingIt is well known that both energy efficiency and productivity are critical for large scale industrial operations. Components such as molds and dies used in powder metallurgy industry and jaws, hoppers, chutes, pumps in mining and cement industry are affected by abrasive wear during raw material handling. Advanced steel grades (with bainite-martensite-carbide microstructure, Hadfield steel) and surface engineering solutions (WC-Co, Cr3C2) offering 10X higher wear resistance have improved productivity and reduced maintenance cost. However, the overall energy efficiency, driven by the electric/diesel power consumed during such operations is ignored. Frictional resistance between ...
April 30, 2019ducom
DLC coating to neutralize fretting of dental implant componentsThe success of two-piece dental implants (Figure 1) is threatened by fretting occurring between the ceramic abutment and the titanium-based fixture. A wrong design could generate mismatches between surfaces and a poor choice of materials would result in excessive micromotions between abutment and fixture. Sliding and fretting wear cause a disproportionate ion release in the surrounding tissues, potentially giving the gingiva a greyish appearance. The lost material enlarges the existing microgaps exposing the implant to bacterial colonization and infections. The extreme consequences of these processes result in the removal of the implant ...
April 30, 2019ducom
Realistic shearing conditions using Extreme Load TribometerIn general, tribometers used in the labs have contacts largely scaled down compared to friction contacts in the real field conditions. It has resulted in several key advantages for the users including short test duration, lower cost of testing, improved test repeatability and ease of testing. However, the largely scaled down contact conditions may not simulate the real life shearing state of lubricants. This often translates into reports with unrealistic friction and wear. Figure 3. Temperature (A) and friction (B) profiles of engine oils with viscosity index (VI) of 163 and 124.Figure 1. Description ...
April 26, 2019ducom
Airplanes are the safest mode of transportation. However, recent airplane crashes have raised several doubts about their safety. According to preliminary reports, recent airplane crashes may be related to pylons that were redesigned to accommodate the latest fuel-efficient gas turbine engines (15% to 20%), which operate with low maintenance costs (20% to 30%). The purpose of this study is to understand the engine efficiency mechanisms that triggered this fatal design.
April 4, 2019Diana Hernandez
On August 28th, 2018 Auburn University hosted their 6th annual Tribology and Lubrication Science Minor Symposium. The event featured a student research symposium, a poster presentation, a keynote seminar by Dr. Kyle Schulze, and much more.
September 11, 2018Deepak Veeregowda
Every four years, Ducom Instruments has the pleasure of attending one of the most impactful tribology conferences in the Asia-Pacific region: ASIATRIB. This year, we’re excited to announce that Ducom will be attending as a platinum sponsor! We couldn’t be more honored to support the event and all its phenomenal attendees. Our new and burgeoning office in Malaysia makes this year’s ASIATRIB that much more significant.
September 11, 2018ducom
Since the advent of tribology, conflicting fundamental laws regarding the relationship that exists between friction and contact area in dry sliding condition have existed. For example, during the late 1400’s, Leonardo da Vinci found that the friction that exists between two surfaces cannot be influenced by its area of contact. By 1699, scientists like Amontons remained in agreeance with da Vinci’s explanation.
July 18, 2018Deepak Veeregowda