Nanoindentation Test Standards

Abstract This study compares data from the two Society of Automotive Engineers test methods for rolling resistance: J-2452 (Stepwise Coast-Down) and J-1269 (Equilibrium) steady state. The ability of the two methods to evaluate tires was examined by collecting data for 12 tires. The data were analyzed and the data showed that the two methods ranked the tires the same after the data were regressed and the rolling resistance magnitude was calculated at the Standard Reference Condition. In addition, analysis of the two methods using this matched set of testing provided an opportunity to evaluate each of these test standards against the other. It was observed that each test has merits absent from the other.

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Reproducible Deposition of Trace Explosives Onto Surfaces for Test Standards Generation

10.21236/ada539502 ◽

2010 ◽

Cited By ~ 1

Author(s):

Ken Yasuda ◽

Marc Woodka ◽

Michael Polcha ◽

Daniel Pinkham

Keyword(s):

Test Standards ◽

Trace Explosives

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Interfacial Bonding Behavior of Stainless Steel / Carbon Steel in Cold Rolling Process

Materials Science Forum ◽

10.4028/www.scientific.net/msf.982.121 ◽

2020 ◽

Vol 982 ◽

pp. 121-127

Author(s):

Shuo Li ◽

Qing Dong Zhang

Keyword(s):

Stainless Steel ◽

Carbon Steel ◽

Great Influence ◽

Rolling Process ◽

Interfacial Bonding ◽

304 Stainless Steel ◽

Nanoindentation Test ◽

Real Contact Area ◽

Steel Matrix ◽

Bonding Quality

A cylindrical indenter was designed to simulate the roller and 304 stainless steel / Q235A carbon steel plate with different roughness were bonded together. The interfacial bonding behavior was investigated by SEM, ultrasonic “C” scanning detection and nanoindentation test. The result reveal that with the increase of contact pressure between interfaces, the atoms of dissimilar metals begin to diffuse across interfaces in some regions, then form island-like bonding regions, and eventually extend to the whole interface. There are no obvious cracks on the surface of stainless steel and carbon steel after deformation. The cold roll-bonding mechanism of stainless steel and carbon steel is that elements on both sides of the interface diffuse and form a shallow diffusion layer under pressure to ensure the joint strength, and the joint bonding strength is greater than the strength of carbon steel matrix. In addition, the surface morphology of base metal has a great influence on the interfacial bonding quality. The higher surface roughness values increases the hardening degree of rough peak, which makes real contact area difficult to increase and reduce the interfacial bonding quality.

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Adaptive speed control method for electromagnetic direct drive vehicle robot driver based on fuzzy logic

Measurement and Control ◽

10.1177/0020294019866841 ◽

2019 ◽

Vol 52 (9-10) ◽

pp. 1344-1353 ◽

Cited By ~ 1

Author(s):

Gang Chen ◽

Weigong Zhang ◽

Xu Li ◽

Bing Yu

Keyword(s):

Fuzzy Logic ◽

Control Method ◽

Tracking Error ◽

Speed Control ◽

System Structure ◽

Direct Drive ◽

Test Standards ◽

Speed Controller ◽

Fuzzy Neural ◽

Vehicle Test

To solve the shortcomings of existing control methods for an electromagnetic direct drive vehicle robot driver, including large speed tracking error and large mileage deviation, a new adaptive speed control method for the electromagnetic direct drive vehicle robot driver based on fuzzy logic is proposed in this paper. The electromagnetic direct drive vehicle robot driver adapts an electromagnetic linear motor as its drive mechanism. The control system structure is designed. The coordinated controller for multiple manipulators is presented. Moreover, an adaptive speed controller for the electromagnetic direct drive vehicle robot driver is proposed to achieve the accurate tracking of desired speed. Experiments are conducted using a Ford FOCUS car. Performances of the proposed method, proportional–integral–derivative, and fuzzy neural network are compared and analyzed. Experimental results demonstrate that the proposed control method can accurately track the target speed, and it can inhabit the change of speed caused by interference under different test conditions, and it has small mileage deviation, which can meet the requirements of national vehicle test standards.

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