02786nam a2200277 a 450000500170000000800410001703500150005810000430007324501100011626000570022630000310028349000270031450001710034150200590051252015110057165000210208265000230210365000290212670000360215570000470219170000490223870000530228771000430234081000590238385600660244220260818090842.0140618s2012    th ad  |||   |000 0 eng d  a.b1213322x1 aChamara, Jayasinghe Arachchilage Supun10aDevelopment of hardness testing technique for the evaluation of localized yielding in steel reinforcement  aPathum Thani :bAsian Institute of Technology,c2012  a199 leaves :bill., charts1 aThesis ;vno. ST-12-01  aA thesis submitted in partial fulfillment of the r equirements for the degree of Master of Engineering in Structural Engineering, School of Engineering and Technology  aThesis (M. Eng.) - Asian Institute of Technology, 2012  aThere are many residual strain detecting methods at  the present but none of them are  suitable to detect residual strain of steel reinfor cement bar due to cost of experiment and  reliability of results. This study mainly focused o n identification of relationship between  the load {u2013} displacement curve of macro- hardness te st and residual strain of rebar. The  extent  of  the  past  studies  covers  the  interpretatio n  of  elastic  properties,  e.g.  elastic  modulus and yield stress, from load {u2013} displacement  relationship by nano {u2013} indentation.  However, no one has proposed the technique used for  investigation of residual strain. This  research  fully  based  on  the  numerical  simulation  of   the  macro  {u2013}  indentation.  The  axisymmetric and the three dimensional finite eleme nt simulation are used to develop the  relationship  between  load  {u2013}  displacement curve  of  i ndentation  and  material  properties  including residual strain of material. It is shown  in this thesis that the best technique for  interpretation  of  material  elastic  properties  and  r esidual  strain  is  the  characteristic  relationship between load and displacement from ind entation test. In this research, there  are shown the pattern of the load {u2013} displacement cu rves are changed with the direction of  the indentation, the curvature of the surface and t he dimensions of test specimen. In detail  comparison results of each case are presented in th is thesis. 0aReinforcing bars 0aHardnessxTesting  0aConcrete beamsxTesting 0 aPunchet Thammarak,eChairperson0 aPennung Warnitchai,eExamination Committee0 aThanakorn Pheeraphan,eExamination Committee0 aRaktipong Sahamitmongkol,eExamination committee2 aThailand (HM King),eScholarship donor2 aAsian Institute of Technology.tThesis ;vno. ST-12-01  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B03998