PPT-Is More Always Better? The Challenge of Unit Creep and Risi

Craig Rutan Santiago Canyon College John Stanskas San Bernardino Valley College James Todd Modesto Junior College 2015 ASCCC Curriculum Institute Overview What is Unit C reep What is Inflated Contact. TIME DEPENDENT BEHAVIOUR CREEP In general the mechanical properties and performance of materials change with increasing temperatures Some properties and performance such as elastic modulus and strength decrease w Activation Energy for Creep The activation energy for creep may be calculated by assuming equation 3 applies ie RT dt exp For a constant stress this may be simplified to RT dt exp 7 where is the effec Beyond a certain limit Corrosion Oxidation Slip Twinning Review brPage 3br Slip Dislocation motion Plastic Deformation in Crystalline Materials Twinning Phase Transformation Creep Mechanisms Grain boundary sliding Vacancy diffusion Dislocation clim X.R. Wang. 1. , S. Malang. 2. , M. S. Tillack. 1 . . 1. University of California, San Diego, CA. 2. Fusion Nuclear Technology Consulting, Germany. ARIES-Pathways Project Meeting. Bethesda, Washington DC. Dara . Navaei. , Siegfried Malang, . Xueren. Wang. ARIES . Project Meeting. Jan. 26. th. ,2011 UCSD. Definition of Creep. Creep is a rate dependent material nonlinearity in which the material continues to deform under a constant load (ANSYS). Creep is highly time dependent and it displays its effects over a long time. Creep has 3 stages:. X.R. Wang. 1. , S. Malang. 2. , M. S. Tillack. 1 . . 1. University of California, San Diego, CA. 2. Fusion Nuclear Technology Consulting, Germany. ARIES-Pathways Project Meeting. Bethesda, Washington DC. Part 2 CREEP  Seasonal down - slope creep tends to decrease with increasing depth into the slope, as shown here (from Sharpe, 1938)  It affects all types of structures and natural Dara . Navaei. , Siegfried Malang, . Xueren. Wang. ARIES . Project Meeting. Jan. 26. th. ,2011 UCSD. Definition of Creep. Creep is a rate dependent material nonlinearity in which the material continues to deform under a constant load (ANSYS). Creep is highly time dependent and it displays its effects over a long time. Creep has 3 stages:. All-Tungsten ARIES Divertor. Jake Blanchard. University of Wisconsin – Madison. (presented by Mark Tillack). Japan/US Workshop on Power Plant Studies and Advanced Technologies. 26-27 February 2013. La gamme de thé MORPHEE vise toute générations recherchant le sommeil paisible tant désiré et non procuré par tout types de médicaments. Essentiellement composé de feuille de morphine, ce thé vous assurera d’un rétablissement digne d’un voyage sur . 2. He goeth about every one of us; and even as an enemy besieging those who are shut up (ina city), he examines the walls, and tries whether there is any part of the walls3644 less firm and lesstrustw HODOLOGY AND SPECIFICATIONS UNDERSTANDING RISI P RICE ASSESSMENTS ................................ .......... 2 ABOUT THIS METHODOLO GY ................................ .............................. Open Forum for RISI Members Bylaws Update2017 Welcome / Agenda Welcome / Agenda Th Bl Rii l i Questions and Answer Session Questions and Answer Session Rationale Wh Bl Ch Ndd y l Ch d Allow each re HODOLOGY AND SPECIFICATIONSKEY CONCEPTS22About this methodology3HOW PRICES ARE ASSESSED3Who assesses prices3Data collection process3Data providers3How data are provided3Assessment calculation4CONTROLS