Test Method for Evaluating Thin Film Fluid Lubricants in a Drain and Dry Mode Using a Pin and Vee Block Test Machine

Based on the motion characteristics of mechanical oscillating parts, a wear test machine is developed with single drive biaxial rotational oscillating, which can effectively simulate multiaxial rotational oscillation of mechanical oscillating parts and take different kinds of friction couplings wear test. Based on this design, the tribological property of easy wearing material in mechanical oscillating parts is studied and corresponding sphere-block test method is established. Pilot test and demonstration are taken to evaluate the sphere-block test method from feasibility, practicality, reliability and economy aspects. The results are meeting test requirements of tribological property under the condition of composite motion.

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Towards a Planar Cruciform Specimen for Biaxial Characterisation of Polymer Matrix Composites

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.24-25.115 ◽

2010 ◽

Vol 24-25 ◽

pp. 115-120 ◽

Cited By ~ 14

Author(s):

Michael R.L. Gower ◽

Richard M. Shaw

Keyword(s):

Strain Distribution ◽

Stress Raiser ◽

Test Method ◽

Image Correlation ◽

Strain Gauges ◽

Test Machine ◽

Element Analysis ◽

Full Field ◽

Cruciform Specimen ◽

Gauge Section

This paper details work undertaken towards the development of a standard test method for the biaxial response of planar cruciform specimens manufactured from carbon fibre-reinforced plastic (CFRP) laminates and subject to tension-tension loading. Achieving true biaxial failure in a cruciform specimen without the need for the inclusion of a stress raiser, such as a hole, in the gauge-section, is a subject attracting much research globally and is by no means a trivial exercise. Coupon designs were modelled using finite element analysis (FEA) in order to predict the stress and strain distributions in the central region of the specimen. An Instron biaxial strong-floor test machine was used to test the specimens. Strain gauges were used to measure the strain in the specimen arms and to assess the degree of bending. Digital image correlation (DIC) was used to measure the full-field strain distribution in the central gauge-section of the specimen and this was compared to values measured using strain gauges. The strain readings obtained from strain gauges, DIC and FEA predictions were in good agreement and showed that the strain distribution was uniform in the central gauge-section, but that strain concentrations existed around the tapered thickness zone. These regions of strain concentration resulted in interlaminar failure and delamination of the laminate propagating into the specimen arms.

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The Development of Accelerated Life Test Method of Multi-Layer Nano Thin Film Glass for Electric Automobiles

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.789.120 ◽

2018 ◽

Vol 789 ◽

pp. 120-125

Author(s):

Young Ju Jeon ◽

Hyeong Seok Han ◽

Ming Yung Shin ◽

Ok Ju Kwak ◽

Hyun Taeck Lim

Keyword(s):

Thin Film ◽

Automobile Industry ◽

High Heat ◽

Development Stage ◽

Test Method ◽

Accelerated Life Test ◽

Life Test ◽

Heating Source ◽

Accelerated Life ◽

Ag Particles

According to expansion of electric automobiles, the multi-layer nano thin film glass withheating source is researched to retain safety driving for winter. Generally, the tungsten wire is usedas a heating source of electric automobile glass. Due to its low visibility, silver (Ag) particles areresearched for years. Ag is widely used as a material of heater in the automobile industry since ithas relatively high heat and electrical conductivities. However, the multi-layer nano thin film glassusing Ag particles is under development stage and is not verified in the field, so recall and claimcan be raised. In this study, we will find the potential failure mechanism of the multi-layer nano thinfilm glass based on the properties, and then suggest accelerated life test method to verify 15 years inthe automobile application.

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