RED CLAY EROSION DEMONSTRATION RESEARCH SECOND ANNUAL REPORT

Vegetation cover and related factors such as litter and organic content of soil, is known to be important in controlling and/or reducing erosion rates (Meeuwig 1971). Other factors such as slope, soil particle size, soil chem­istry and water content are also important. This project was designed to provide an analysis of present cover on two water­ sheds in the Nemadji Basin. This, in turn, could be useful in determining lo­ cations of specific demonstration projects, serving as a guide in developing practical land management procedures utilize present cover capabilities in minimizing red clay erosion and to provide, from the historical record, an in­dication of cover prior to the settlement of the area. The latter might provide insights into the extent of the erosion problem at the time of the survey as well as an indication of vegetation cover which was not under man's influence. This9 the final report, is presented in three sections. Part One treats pre­ settlement vegetation, Part Two current vegetation and Part Three offers bird summaries and recommendations

A new multiaxial specimen for determining dynamic properties of adhesive joints

International audienceAdhesive joints are increasingly introduced in industrial structures for bonding critical parts. Their mechanical characterization is a key element for design and is, therefore, necessary. A significant work has been done for the characterization under quasi-static conditions, but techniques are rather limited for dynamic conditions. Indeed, existing dynamic studies characterize adhesive assemblies and not the adhesive joint alone, and do not investigate multiaxial loadings. Thus, this paper proposes an innovative experimental technique for the characterization of adhesive joints under dynamic multiaxial loadings. The experimental method relies on three main components: i) a conventional Split Hopkinson Pressure Bar (SHPB) apparatus, ii) a novel specimen named as DODECA enabling to test three distinct multiaxial loadings with the same methodology and iii) local strain and stress measurements performed by Digital Image Correlation (DIC). The paper exhibits all steps of the experimental procedure as well as underlying preparation and measuring methods. Stress and strain in the adhesive joint are estimated from experimental data directly both during loading and at the failure point. Finally, the dynamic material behavior of the adhesive joint is identified from the data

An Experimental Technique For The Characterization Of Adhesive Joints Under Dynamic Multiaxial Loadings

International audienc