Evaluation Methods Research Based on the Concrete with Rheological Properties

2016 ◽  
Vol 878 ◽  
pp. 170-175
Author(s):  
Jia Chao Lin ◽  
Yu Xin Gao ◽  
Wei Qin Li ◽  
Xiong Wu ◽  
Yi Xiong Huang ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Common Property ◽  
Evaluation Method ◽  
Evaluation Methods ◽  
Test Method ◽  
High Rise ◽  
High Rise Building ◽  
Concrete Quality

As the high-rise building springs, pumping height of concrete becomes higher, which leads to futility of common property indexes to evaluate the concrete pumpability. This paper proposed a test method on concrete rheological properties to quantize its pumpability and established evaluation method on concrete pumpability to make some exploration regarding the scientifically reasonable control on concrete quality.

An Upsetting - Ironing Type Tribo-Meter for Evaluating Tribological Performance of Lubrication Coatings for Cold Forging

2013 ◽  
Vol 535-536 ◽  
pp. 243-246 ◽  
Author(s):  
Masatoshi Hirose ◽  
Zhi Gang Wang ◽  
Shinobu Komiyama
Keyword(s):  
Evaluation Method ◽  
Complex Shape ◽  
Evaluation Methods ◽  
Tribological Performance ◽  
Test Method ◽  
Cold Forging ◽  
Lubrication Performance ◽  
Processing Modes ◽  
Surface Expansion ◽  
The Difference

In recent years, many attempts are being made to develop new lubrication coatings for cold forging. In general, an alternative coating is designed based on the results of the evaluation methods that simulate the frictional condition of cold forging. Various evaluation methods have been proposed and used to design an alternative coating according to the processing purpose. However a lot of parts are manufactured by the multistage forging machine such as parts forming machine, complex shape being produced recently by combined processing. A lubrication coating in such an environment is exposed to repeatedly in a variety of processing modes, and received serious damage. At present the performance of an alternative coating isn’t enough to satisfy needs of market in such a multistep forging. Development of lubricant that can satisfy such demands needs a new evaluation method. This comes the purpose of this study. An newly devised tribometer consists of an ironing process after upsetting process. We designed this test method by using finite element(FE) analysis. In upsetting, damage to the lubrication coating is given by the expansion of free surface. In ironing, the performance of lubrication coating destroyed by upsetting is evaluated. By using the upsetting-ironing type tribometer, the lubrication performance under a large surface expansion and a high pressure can be evaluated. In addition, the degree of coating damage can be adjusted by changing upset ratio and height of billet. The difference in the lubrication performance of the bonderised and the prototype alternative coating was examined by this evaluation method.

Partial Collapse During Construction of a High Rise Building Due to Fire

2005 ◽  
Vol 90 (5) ◽  
pp. 42-48
Author(s):  
Predrag L. Popovic ◽  
Richard C. Arnold
Keyword(s):  
High Rise ◽  
High Rise Building

Robust Test Method of TSOP PEMs for Space Application

2019 ◽  
Author(s):  
Yasunobu Iwai ◽  
Koichi Shinozaki ◽  
Daiki Tanaka
Keyword(s):  
Evaluation Method ◽  
Low Cost ◽  
Reliability Evaluation ◽  
Test Method ◽  
Thermal Shock Test ◽  
Space Application ◽  
Space Applications ◽  
Limit Test ◽  
Long Time ◽  
Short Time

Abstract Compared with space parts, consumer parts are highly functional, low cost, compact and lightweight. Therefore, their increased usage in space applications is expected. Prior testing and evaluation on space applicability are necessary because consumer parts do not have quality guarantees for space application [1]. However, in the conventional reliability evaluation method, the test takes a long time, and the problem is that the robustness of the target sample can’t be evaluated in a short time. In this report, we apply to the latest TSOP PEM (Thin Small Outline Package Plastic Encapsulated Microcircuit) an evaluation method that combines preconditioning and HALT (Highly Accelerated Limit Test), which is a test method that causes failures in a short time under very severe environmental conditions. We show that this method can evaluate the robustness of TSOP PEMs including solder connections in a short time. In addition, the validity of this evaluation method for TSOP PEM is shown by comparing with the evaluation results of thermal shock test and life test, which are conventional reliability evaluation methods.

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