12- 20 October 2010

12- 20 October 2010 - INTRODUCTION TO POLYMER SCIENCE AND...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
INTRODUCTION TO POLYMER SCIENCE AND ENGINEERING MEEG380 FALL 2010 LECTURE NOTES October 20, 2010
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
MECHANICAL PROPERTIES OF POLYMERS Ebru GUNISTER CANBAZ MEEG380 Introduction to Polymer Science and Engineering Fall 2010 Introduction and basics Elastic stress-strain relations Mechanical response of polymers Regions of mechanical loading in polymers Reversible deformation behavior Linear viscoelastic behavior Nonlinear viscoelastic behavior Irreversible deformation behavior and fracture Plastic deformation mechanism Fracture and failure behavior
Background image of page 2
MECHANICAL PROPERTIES OF POLYMERS Ebru GUNISTER CANBAZ MEEG380 Introduction to Polymer Science and Engineering Fall 2010 Mechanical deformation - Tension a 0 b 0 L 0 Force, F 0 0 0 A F b a F x e , Engineering stress: y x z Elongation: (strain) 0 L ΔL x 0 b Δb z 0 a Δa y x z x y Poisson`s ratio: (for isotropic materials) area, A 0 0 ) 2 1 ( V V Volume change: for incompressible materials =0.5
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
MECHANICAL PROPERTIES OF POLYMERS Ebru GUNISTER CANBAZ MEEG380 Introduction to Polymer Science and Engineering Fall 2010 Mechanical behavior of plastics Plastics behave in brittle manner at low temperature and under at high rate of loading Thermosets are more brittle than thermoplastics (network) Semi-crystalline are generally less brittle that amorphous plastics (PS and SAN are particularly brittle)
Background image of page 4
MECHANICAL PROPERTIES OF POLYMERS Ebru GUNISTER CANBAZ MEEG380 Introduction to Polymer Science and Engineering Fall 2010 Elastic Stress-Strain Response Hookean behavior: E Stress at break: b Strain at break: b E 1 b b E 1 Reversible Deformation E: modulus of elasticity (stiffness)
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
MECHANICAL PROPERTIES OF POLYMERS Ebru GUNISTER CANBAZ MEEG380 Introduction to Polymer Science and Engineering Fall 2010 Elastic Mechanical Deformation - Shear Force, F F y x z y x Area, A A F shear stress: x y shear strain: G shear modulus: ) 1 ( 2 G E for isotropic materials:
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/05/2011 for the course MEEG 380 taught by Professor Eg during the Winter '11 term at NE Texas CC.

Page1 / 22

12- 20 October 2010 - INTRODUCTION TO POLYMER SCIENCE AND...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online