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Mekanika Metalurgi  2010,[object Object],PENGUJIAN  TARIK,[object Object],Oleh :,[object Object],Farid Widi Arfika,[object Object],2406 100 013,[object Object],Teknik Fisika,[object Object],Fakultas Teknologi Industri,[object Object],Institut Teknologi Sepuluh Nopember Surabaya,[object Object]
Tujuan Uji Tarik,[object Object],	Pengujian tarik bertujuan untuk mengetahui sifat-sifat mekanik dan perubahan perubahannya,[object Object]
Definisi Stress – Strain ,[object Object],Engineering Stress,[object Object],Engineering Strain,[object Object],Direct Stress - Tension,[object Object],Direct Stress - Compression,[object Object]
Poisson’s Ratio,[object Object],RANGES,[object Object],0.25 – 0.27 for Cast Iron,[object Object],0.27 – 0.30 for Steel,[object Object],0.30 – 0.33 for Aluminum and Titanium,[object Object]
Poisson’s Ratio,[object Object]
Shear Stress and Strain,[object Object],Shear Stress,[object Object],Shear Strain,[object Object],shear stress, t = Shear Load / Area,[object Object],shear strain, g = angle of deformation (radians),[object Object],shear modulus, G = t /g (elastic region),[object Object]
Modulus of Rigidity in Shear,[object Object],Measure of resistance to shear deformation.,[object Object]
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Pengujian  tarik memet ppt
Engineering Stress-Strain Curve,[object Object],Elongation,[object Object],Sy,[object Object],0.2% offset ,[object Object],yield stress,[object Object],Engineering Stress, S=P/Ao ,[object Object],(Ultimate),[object Object],E,[object Object],Su,[object Object],E,[object Object],Proportional Limit,[object Object],Engineering Strain, e = DL/Lo),[object Object]
11,[object Object],TegangandanRegangan dari Bahanbajalunak,[object Object]
12,[object Object],Mulaidari O ke A = garislurusberarti linier atauproporsionaldisebut modulus elastisitas,[object Object],Titik B titikluluh,[object Object],Antara B dan C terjadiperpanjangantanpaadapertambahangayatarikdisebutplastissempurna,[object Object],Utk material logam, umumnya deformasielastisterjadi < 0,005 regangan,[object Object],Regangan > 0,005 terjadideformasiplastis (deformasipermanen),[object Object]
Engineering Stress-Strain Curve,[object Object],Elongation,[object Object],Sy,[object Object],0.2% offset ,[object Object],yield stress,[object Object],Engineering Stress, S=P/Ao ,[object Object],(Ultimate),[object Object],E,[object Object],Su,[object Object],E,[object Object],Proportional Limit,[object Object],Engineering Strain, e = DL/Lo),[object Object]
Example: find yield strength, ultimate strength and modulus of elasticity:,[object Object]
Example: find yield strength and ultimate for material that does not exhibit knee behavior,[object Object]
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Pengujian  tarik memet ppt
Pengujian  tarik memet ppt
Elastic and Plastic Strain,[object Object],P,[object Object],(e,S),[object Object],Stress,[object Object],Total Strain,[object Object],The 0.2% offset yield stress,[object Object],is the stress that gives a plastic,[object Object],(permanent) strain of 0.002.,[object Object],Strain,[object Object],Plastic,[object Object],Elastic,[object Object],ee,[object Object],ep,[object Object]
Ductile Vs Brittle Materials,[object Object],Ductile if EL%>8% (approximately),[object Object],Brittle if EL% < 5% (approximately) ,[object Object],Engineering Stress,[object Object],Engineering Strain,[object Object]
Keuletan(Ductility)- EL% & AR%,[object Object],Elongation,[object Object],Area Reduction,[object Object],Lo,[object Object],Ao,[object Object],Lf,[object Object],Af,[object Object]
Brittle Materials,[object Object],The stress-deflection curve for MgO obtained from a bend test.,[object Object]
Ketangguan(Toughness), Ut,[object Object],Su,[object Object],Sy,[object Object],Engineering Stress, S=P/Ao ,[object Object],Engineering Strain, e = DL/Lo),[object Object]
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Kelentingan (Resilience), Ur,[object Object],Su,[object Object],Sy,[object Object],Engineering Stress, S=P/Ao ,[object Object],E,[object Object],ey,[object Object],Engineering Strain, e = DL/Lo),[object Object]
Tegangan sejati , regangan sejati (true stress, true strain) ,[object Object]
Perbandinganantarakurvategangan-reganganrekayasadansesungguhnyadaribajakarbonrendah (mild steel) ,[object Object]
Mode Perpatahan Material,[object Object]
PerpatahanUlet,[object Object],Tahapanterjadinyaperpatahanuletpadasampelujitarik:   ,[object Object],(a)  Penyempitanawal; ,[object Object],(b) Pembentukanrongga-ronggakecil (cavity); ,[object Object],(c) Penyatuanrongga-ronggamembentuksuaturetakan; ,[object Object],(d) Perambatanretak; ,[object Object],(e) Perpatahangeserakhirpadasudut 45°. ,[object Object]
foto SEM dariperpatahanulet,[object Object],Tampilanpermukaanpatahandarisuatusampellogam  yang  ditandaidenganlubang-lubangdimpelsebagaisuatuhasilprosespenyatuanrongga-ronggakecil(cavity) selamapembebananberlangsung,[object Object]
PerpatahanGetas,[object Object],Perpatahangetasmemilikiciri-cirisebagaiberikut: ,[object Object],[object Object]
Retak/perpatahanmerambatsepanjangbidang-bidangkristalinmembelah  atom-atom material (transgranular).
Padamaterial lunakdenganbutirkasar (coarse-grain) makadapatdilihatpola-pola yang dinamakan  chevrons  or  fan-like  patternyang  berkembangkeluardaridaerahawalkegagalan.
Material  kerasdenganbutirhalus  (fine-grain)  tidakmemilikipola-polayang  mudahdibedakan.
Material  amorphous  (sepertigelas)  memilikipermukaanpatahanyang  bercahayadanmulus. ,[object Object]
Contoh Material Uji Tarik,[object Object]
Polimer,[object Object],Skema percobaan perpanjangan untuk polimer semicrystalline seperti PE pada suhu kamar. (from Rodrigues) (Dari Rodrigues),[object Object]
Polimer,[object Object]
Baja,[object Object]
Aluminium,[object Object]
Tension Test,[object Object],Measures P,[object Object],Extensometer,[object Object],Measures DL,[object Object],Typical Universal ,[object Object],Testing Machine,[object Object]
Modern Materials Testing System,[object Object],Hydraulic,[object Object],Wedge ,[object Object],Grips,[object Object],Specimen,[object Object],Extensometer,[object Object]
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