Wrinkling during cup drawing with NUMISHEET2014 benchmark test

Wrinkling occurs when a blank is subjected to compressive stresses during the forming process as in the flange of a cup during drawing. Although the failure limit due to plastic flow localization can be simply defined by the FLC at each point of a continuum, the wrinkling limit cannot be defined with simple variables such as strain, stress, and thickness. Wrinkling is strongly affected by the mechanical properties of the sheet material, the geometry of the tools and blank, and contact conditions. The analysis of wrinkling initiation and growth is, therefore, difficult to perform due to the complex synergistic effects of the controlling parameters. Because of these difficulties, the study of wrinkling has generally been conducted case by case. A unique wrinkling criterion, which could be used effectively for various sheet forming processes, has not yet been proposed. There were many investigations on the effect of process parameters (BHF and friction) and geometry on wrinkling. However, there are few reported results on the influence of the material model on wrinkling. This paper shows how strain hardening and r-values affect wrinkle formation in its magnitude, initiation, and direction through the NUMISHEET2014 benchmark test for wrinkling during cup drawing.

Drawing information : what's a map?

Mapping has in recent years become one of the most common architectural strategies to approach the knowledge of reality. Its real or apparent objectivity has led, in many cases, to consider this system as the only valid approximation to an object of study, discarding other more synthetic, intuitive and impervious procedures of systematic analysis for being partial and subjective. Leaving aside these erroneous exclusions, it is undeniable that the sophisticated contemporary development of maps has produced an enormous range of possibilities.

Drawing process : what's a diagram?

Within the architectural universe there have been numerous attempts in recent years to define the term diagram. Etymologically, it means exclusively “through graphic representation”, which does not clarify much (from the Greek, dia, through + gramma, graphic representation). Jennifer Sigler defines it as the minimum graphic element that explains a concept. Federico Soriano borrows from Federico García Lorca, and claims that diagrams are the marrow of form or content. Efforts to clarify the nature of these powerful graphical representations have multiplied at a similar rate as its ever-increasing use in contemporary architectural projects.

Size effects in micro cup drawing

Experimental studies into the effect of blank thickness on the deep drawing response of the coarse-grained and ultrafine-grained copper demonstrated the occurrence of a size effect: the dependence of the maximum load and the limit drawing ratio on the blank thickness in sub-millimetre range. A dislocation based constitutive model taking into account the thickness effects was used for numerical simulations of the process. It was demonstrated that the occurrence of the blank thickness effect is governed by the ratio of the blank thickness t to the grain size D of the material. Critical values of the t/. D ratio below which the size effect comes to bearing were determined. The obtained results can be seen as a demonstration of more general suitability of the model developed for predicting microforming operations with full account of the specimen or work-piece dimensions.

Exquisite corpse: drawing the uncanny

Exquisite corpseExquisite corpse was a technique created by the surrealists. It was a type of game played by using images. What we would like to look at together is to question where these images come from. And also, why are some images “uncanny”?

Remembering the future : Warlpiri life through the prism of drawing

As well as the truths the drawings might speak, The book concerns itself with the beguiling questions that remain unanswered and the limits of scholarship.

Introduction: the drawing bazaar

Introduction to the research book explaining the reasons behind the need of this publication in the context of architectural education, highlighting the double value of drawing for architects: instrumental as a fundamental tool that qualifies the design process; and autonomous, contemplating the drawing of the architect as a final product in itself beyond the mere illustration and documentation of the project of architecture.

A gallery walk: 'drawing out' understandings of collaborative self-study in teacher education

The Collaborative Reflective Experience and Practice in Education (CREPE) Research Group formed mid 2014 as a group of eight teacher educators interested in working collaboratively to improve our teaching practice through self-study methodology. Located at distance across the three campuses of Deakin University in Victoria, Australia and from the disciplines of mathematics, science, visual arts, performing arts, and curriculum and pedagogy, we aimed to better understand, improve, and share our practices as teacher-educators. While a few of us had engaged in self-study previously, all were comfortable with observing some kind of professional reflective/reflexive practice. We shared the intention of engaging in the scholarship (teaching practice and research) of self-study methodology via community of practice approaches, focusing on our collaborative (overarching) research as well as engaging in focused research simultaneously. It is our efforts towards collaborative research that are the subject of this chapter.