scholarly journals Assessment of Self-Piercing Riveted Joints Using the Analytic Hierarchy Process

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 760
Author(s):  
Ebad Bagherpour ◽  
Yan Huang ◽  
Zhongyun Fan
Keyword(s):  
Analytic Hierarchy Process ◽  
Peel Strength ◽  
Assessment Method ◽  
Analytic Hierarchy ◽  
Joint Performance ◽  
Systematic Assessment ◽  
Die Profile ◽  
Minimum Requirements ◽  
Aluminium Sheets ◽  
Hierarchy Process

Self-piercing riveting (SPR) as a solid-state joining technology has recently found extensive applications in the automotive industry, mostly in the joining of car body aluminium sheets. To achieve an acceptable joint, key operation and tooling parameters, including set force, die profile, and rivet shape and hardness, should be selected appropriately. To evaluate joint performance, the interlocking parameters and joint strength have to be determined. In the current laboratory and industrial practices, joint quality is assessed according to requirements of individual applications, lacking a systematic assessment method. The goal of the present study is to develop a method to determine the SPR conditions that produce a joint of the best quality, based on an analytic hierarchy process (AHP), which is a methodology for relative measurement. A general AHP model was proposed for analysing SPR and joint performance in different conditions and with an unlimited number of criteria and alternatives. Joints of two layers of 2.5 mm thick AA6082 aluminium sheets in T6 condition were produced using various dies, rivets, and SPR processing conditions. A selection of seven joints, which achieved minimum requirements in terms of interlocking parameters and strength, was nominated for AHP assessment. With the application of six criteria, including head height, bottom thickness, minimum bottom thickness, deformed rivet diameter, shear strength, and peel strength, the AHP assessment was able to define the best conditions for the SPR joining of the aluminium alloy sheets.

Assessment Reasearch about Agricultural Water Level

2011 ◽  
Vol 71-78 ◽  
pp. 2479-2482
Author(s):  
Ling Hua Wang ◽  
Rui Lian Wang ◽  
Pan Hua Ning
Keyword(s):  
Analytic Hierarchy Process ◽  
Water Level ◽  
Assessment Method ◽  
Agricultural Water ◽  
Analytic Hierarchy ◽  
Assessment Index ◽  
System Utilization ◽  
Assessment Index System ◽  
Hierarchy Process ◽  
Water Assessment

According to characteristics about the agricultural water, agricultural water level assessment index system was structured, and Analytic Hierarchy Process was used to determine the importance of each hierarchy in the system. The fuzzy scheme optimum method which was adopted to assess the agriculture system utilization water level. So the fuzzy problems about how to use mathematic method to analyse and deal with the agricultural water assessment were solved to a certain extent. The final result of the example indicated that fuzzy comprehension assessment method could reflect utilization water characteristic in different areas and also showed that the method is correct and practical.

scholarly journals Durability Assessment of Lightweight Cellular Concrete in Subgrade by the Method of Analytic Hierarchy Process Combined with Fuzzy Comprehensive Evaluation

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Xin Liu ◽  
Chengwei Ni ◽  
Liye Zhang ◽  
Ke Sheng ◽  
Baoning Hong
Keyword(s):  
Analytic Hierarchy Process ◽  
Influencing Factors ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Assessment Method ◽  
Assessment Model ◽  
Analytic Hierarchy ◽  
Durability Assessment ◽  
Hierarchy Process ◽  
Cellular Concrete

The durability of lightweight cellular concrete (LCC) and the corresponding assessment method are studied in this paper to improve the utilization of LCC in subgrade construction engineering. The durability assessment method is established by combining the analytic hierarchy process (AHP) with fuzzy comprehensive evaluation (FCE). The main assessment processes are as follows. Firstly, based on the physical and mechanical properties of LCC, the influencing factors are selected in terms of preliminary design, construction technology, and operation and management after completion of construction. The grading standard of influencing factors is established as well. Secondly, a multilevel assessment model with targets level, criteria level, and indexes level is established. AHP determines the effective weight of the lower level relative to the upper level. The consistency check of the judgment matrix is conducted to prove the rationality of the distribution of influencing factors’ effect weight. Thirdly, the membership function which is suitable for each influencing factor is built to calculate the membership degree. Besides, the practicality and reliability of AHP combined with FCE are demonstrated through a practical engineering case, which is the third section of a highway in Guangdong Province, China.

System Target Damage Assessment Based on FAHP

2013 ◽  
Vol 321-324 ◽  
pp. 2367-2370
Author(s):  
Xiao Nan Zhang ◽  
Si Lang Du ◽  
Jun Feng Yang ◽  
Wei Cao
Keyword(s):  
Analytic Hierarchy Process ◽  
Damage Assessment ◽  
Target Function ◽  
Assessment Method ◽  
Analysis Method ◽  
Analytic Hierarchy ◽  
Base Damage ◽  
Hierarchy Analysis ◽  
Set Up ◽  
Hierarchy Process

It is found that the traditional BDA methods are not appropriate the system target BDA. A new method of the system target BDA is proposed in this paper. Firstly, based on Hierarchy Analysis Method (AHP), the system target function index system is set up. Secondly, the step of system target function damage assessment method is analyzed and proposed based on Fuzzy Analytic Hierarchy Process (FAHP). Finally, an example of air base damage assessment is given to verify the validity and availability of the proposed method.

Comprehensive Assessment Method for Pile Construction Quality Based on Analytic Hierarchy Process

2013 ◽  
Vol 838-841 ◽  
pp. 245-249
Author(s):  
Yong Chun Cheng ◽  
Hong Bin Guo ◽  
Xian Qiang Wang ◽  
Yu Bo Jiao
Keyword(s):  
Analytic Hierarchy Process ◽  
Quality Assessment ◽  
Evaluation Method ◽  
Assessment Method ◽  
Comprehensive Assessment ◽  
Assessment Model ◽  
Geological Condition ◽  
Construction Quality ◽  
Analytic Hierarchy ◽  
Hierarchy Process

In this paper, a new comprehensive assessment method of pile construction quality based on analytic hierarchy process is proposed considering that the current specification is uncertain about quality assessment. This method establishes the comprehensive assessment index system of pile construction quality taking account of the influence of the pile velocity, pile length, geological condition, bridge importance level, pile defects and other parameters on pile construction quality assessment. It constructs pile construction quality assessment model through determining the weight of each index based on analytic hierarchy process to improve the evaluation method of pile construction quality. The good results achieved in practical engineering demonstrate that the proposed method possesses favorable accuracy.

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