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Shear Load (shear + load)

Distribution by Scientific Domains

Engineering	80%

Selected Abstracts

Shear-Mode Contact Splitting for a Microtextured Elastomer Film

ADVANCED MATERIALS, Issue 33 2010
Rebecca K. Kramer
Texturing the surface of a PDMS film with microscale pillars allows shear load to be uniformly distributed through the interface that bonds the film to a rigid substrate. This mechanism is demonstrated with shear tests on micropatterned samples and explains the order-of-magnitude enhancement of shear adhesion compared to smooth, untextured PDMS films. [source]

Untersuchungen zum Einfluss von Temperatur und Holzfeuchte auf das Versagensverhalten von ausgewählten Klebstoffen bei Zugscherbeanspruchung

BAUPHYSIK, Issue 5 2009
Peter Niemz Prof. Dr.-Ing. habil.
Feuchte; Versuche; moisture; experimental set-ups Abstract An drei verschiedenen Klebstoffen wurde der Einfluss von Temperatur und relativer Luftfeuchte auf die Scherfestigkeit im Zugscherversuch geprüft. Es wurden zwei handelsübliche Klebstoffe (PVAc, Harnstoffharz) und ein labortechnisch hergestellter 1KPUR bei erhöhter Temperatur und relativer Luftfeuchte geprüft. Ergänzend wurde mittels Video Image Correlation die Verzerrung im Bereich der Klebfuge ermittelt und daraus ein Schubmodul der Klebfuge berechnet. Studies on the influence of temperature and timber moisture on the failure behaviour of selected adhesives under tensile shear load. The influence of temperature and relative humidity on shear strength was tested in a tensile shear test with three different adhesives. Two standard adhesives (PVAc, urea resin) and a 1KPUR (one-component polyurethane adhesive) produced in the laboratory were tested at a high temperature along with relative humidity. In addition distortion around the glue joint was measured by means of video image correlation and a shear modulus of the glue joint calculated from this. [source]

Bemessung von Dübeln am Bauteilrand unter Querlast: Ingenieurmäßiger Ansatz zur Berücksichtigung der Lastrichtung

BETON- UND STAHLBETONBAU, Issue 6 2005
Rainer Mallée Dr.-Ing.
Es wird ein allgemeingültiger Bemessungsansatz für Dübel unter Querlast am Bauteilrand bei der Versagensart Betonkantenbruch abgeleitet. Die Richtung der Querlast wird bei der Lastverteilung auf die einzelnen Dübel einer Gruppe berücksichtigt. Damit kann das Modell für Anwendungen ohne und mit Lochspiel sowie für Querlasten und für Torsionsmomente angewendet werden. Design of Anchors close to an Edge under Shear Loads Engineering Approach for Consideration of the Load Direction A universally valid proposal is made for the design of anchors close to an edge under shear loads for concrete edge failure. The angle of the shear load is taken into account during determination of the load distribution on each anchor of a group. Thus the model may be used for applications without and with hole clearance and for shear loads as well as for torsion moments. [source]

Friction and degradation of rock joint surfaces under shear loads

INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, Issue 10 2001
F. Homand
Abstract The morpho-mechanical behaviour of one artificial granite joint with hammered surfaces, one artificial regularly undulated joint and one natural schist joint was studied. The hammered granite joints underwent 5 cycles of direct shear under 3 normal stress levels ranging between 0.3 and 4 MPa. The regularly undulated joint underwent 10 cycles of shear under 6 normal stress levels ranging between 0.5 and 5 MPa and the natural schist replicas underwent a monotonics shear under 5 normal stress levels ranging between 0.4 and 2.4 MPa. These direct shear tests were performed using a new computer-controlled 3D-shear apparatus. To characterize the morphology evolution of the sheared joints, a laser sensor profilometer was used to perform surface data measurements prior to and after each shear test. Based on a new characterization of joint surface roughness viewed as a combination of primary and secondary roughness and termed by the joint surface roughness, SRs, one parameter termed ,joint surface degradation', Dw, has been defined to quantify the degradation of the sheared joints. Examinations of SRs and Dw prior to and after shearing indicate that the hammered surfaces are more damaged than the two other surfaces. The peak strength of hammered joint with zero-dilatancy, therefore, significantly differs from the classical formulation of dilatant joint strength. An attempt has been made to model the peak strength of hammered joint surfaces and dilatant joints with regard to their surface degradation in the course of shearing and two peak strength criteria are proposed. Input parameters are initial morphology and initial surface roughness. For the hammered surfaces, the degradation mechanism is dominant over the phenomenon of dilatancy, whereas for a dilatant joint both mechanisms are present. A comparison between the proposed models and the experimental results indicates a relatively good agreement. In particular, compared to the well-known shear strength criteria of Ladanyi and Archambault or Saeb, these classical criteria significantly underestimate and overestimate the observed peak strength, respectively, under low and high normal stress levels. In addition and based on our experimental investigations, we put forward a model to predict the evolution of joint morphology and the degree of degradation during the course of shearing. Degradations of the artificial undulated joint and the natural schist joint enable us to verify the proposed model with a relatively good agreement. Finally, the model of Ladanyi and Archambault dealing with the proportion of total joint area sheared through asperities, as, once again, tends to underestimate the observed degradation. Copyright © 2001 John Wiley & Sons, Ltd. [source]