This book of recommendations presents an overview of High Frequency Mechanical Impact (HFMI) techniques existing today in the market and their proper procedures, quality assurance measures and documentation. Due to differences in HFMI tools and the wide variety of potential applications, certain details of proper treatments and quantitative quality control measures are presented generally. An example of procedure specification as a quality assurance measure is given in the Appendix. Moreover, the book presents procedures for the fatigue life assessment of HFMI-improved welded joints based on nominal stress, structural hot spot stress and effective notch stress. It also considers the extra benefit that has been experimentally observed for HFMI-treated high-strength steels. The recommendations offer proposals on the effect of loading conditions like high mean stress fatigue cycles, variable amplitude loading and large amplitude/low cycle fatigue cycles. Special considerations for low stress concentration welded joints are also given. In order to demonstrate the use of the guideline, the book provides several fatigue assessment examples.
This book provides practicing engineers, researchers, and students with a working knowledge of the fatigue design process and models under multiaxial states of stress and strain. Readers are introduced to the important considerations of multiaxial fatigue that differentiate it from uniaxial fatigue.
Sand Creek. At dawn on the morning of November 29, 1864, Colonel John Milton Chivington gave the command that led to slaughter of 230 peaceful Cheyennes and Arapahos—primarily women, children, and elderly—camped under the protection of the U. S. government along Sand Creek in Colorado Territory and flying both an American flag and a white flag. The Sand Creek massacre seized national attention in the winter of 1864-1865 and generated a controversy that still excites heated debate more than 150 years later. At Sand Creek demoniac forces seemed unloosed so completely that humanity itself was the casualty. That was the charge that drew public attention to the Colorado frontier in 1865. That was the claim that spawned heated debate in Congress, two congressional hearings, and a military commission. Westerners vociferously and passionately denied the accusations. Reformers seized the charges as evidence of the failure of American Indian policy. Sand Creek launched a war that was not truly over for fifteen years. In the first year alone, it cost the United States government $50,000,000. Methodists have a special stake in this story. The governor whose polices led the Cheyennes and Arapahos to Sand Creek was a prominent Methodist layman. Colonel Chivington was a Methodist minister. Perhaps those were merely coincidences, but the question also remains of how the Methodist Episcopal Church itself responded to the massacre. Was it also somehow culpable in what happened? It is time for this story to be told. Coming to grips with what happened at Sand Creek involves hard questions and unsatisfactory answers not only about what happened but also about what led to it and why. It stirs ancient questions about the best and worst in every person, questions older than history, questions as relevant as today’s headlines, questions we all must answer from within.
This unique, hands-on reference for school administrators offers guidelines for effective student engagement as well as reproducible action tools that will enable you to identify and share The Big Eight Student Engagement Strategies with your teachers, promote teacher growth and provide support for new and/or struggling teachers, collect data to help you consult and coach teachers effectively in student engagement, and provide direct assistance with skills and strategies to sharpen student engagement.
Thank you for visiting our website. Would you like to provide feedback on how we could improve your experience?
This site does not use any third party cookies with one exception — it uses cookies from Google to deliver its services and to analyze traffic.Learn More.