Modelling and Simulation on Penetration into Stone Concrete

Penetration into stone concrete is an important research area of concrete penetration, and related experiments and simulation tests have been carried out. However, complete theories have not been formed yet. This paper develops a differential facet resistance model for penetration into stone concrete target. Firstly, the plastic damage model is used to analyze the penetration of concrete target, and the reliability of the numerical model is verified by comparing with the classical experimental results. Besides, the numerical model of stone concrete is established based on 3D Voronoi diagram according to the random characteristics of the shape and spatial distribution of stones in concrete. Then, simulation tests are carried out with the validated numerical model, a differential facet resistance model suitable for the penetration of stone concrete target is then proposed referring to the resistance formula of Forrestal and Rosenberg. At last, a method for fast calculation of penetration into stone concrete is introduced.

effectiveness of e-ID card services in subdistrict city North Ternate

This research is a descriptive qualitative study to analyze or explain the effectiveness of e-ID services in Ternate City District Office in improving the handling of service of e-ID; study descriptive aimed to explain something the object of research is relatively deep and focused on the object study. The research results show that the implementation of e-ID services in the District of North Ternate City began recording the mass until manually recording is currently not implemented effectively. This can be proven by several indicators of effectiveness measurement, namely the Achievement of Objectives in terms of the time target has not been achieved. In terms of the final goal, which is the concrete target of recording implementation for compulsory e-ID Card, only 92.49% have been recorded while the remaining 7.51 % have not been recorded. There is miscommunication between the sub-district government and the civil registry office of Ternate City so that for now, all recordings have been pulled in the civil registry office of Ternate City.

Engineering Approximate Analysis Method of Rod Projectile Penetrating Concrete Target

The penetration process of rod projectile into concrete target is very complex, and the theoretical analysis is very difficult. In this paper, by using the engineering approximation method, through some reasonable simplification of the rod projectile penetration model, the analytical formulas of the penetration resistance, penetration depth and other important physical quantities are established. Through the calculation of penetration depth, when the sliding friction coefficient is 0.1, the results are in good agreement with the experimental results. The results show that the higher the projectile density and the sharper the shape of the warhead, the stronger the penetration ability.