An indirect J-integral technique for measuring the tension softening curve of non-yielding materials like concrete is presented and is applied to mortars reinforced with various short fiber types (steel and synthetic). The tension softening curve serves to characterize and measure material fracture resistance. The dependence of structural behavior on material fracture resistance is investigated...

In this paper, an incremental variational formulation for damage at finite strains is presented. The classical continuum damage mechanics serves as a basis where a stress-softening term depending on a scalar-valued damage function is prepended an effective hyperelastic strain energy function, which describes the virtually undamaged material. Because loss of convexity is obtained at some critica...

High performance fiber reinforced cement-based composite (HPFRCC) materials have unique properties that are advantageous for many structural applications. In direct tension these materials can reach strains between 0.5% and 6% depending on material and specimen geometry. The large tensile strain capacity allows these materials to strain compatibly with steel reinforcement and achieve higher ten...

Zinc oxide-eugenol (ZOE) is usually applied clinically as dental filling material for thermal insulation and temporary restoration. The objective of this study was to use ZOE as a composite matrix and low melting-point polyester fibers or fabrics as reinforcement. The added fibers or fabrics increased the composite materials’ compressive load by 250 N and 290 N, respectively. Fiber length and t...

The importance of fibre reinforced plastics continually increases due to the excellent mechanical properties, low material and manufacturing costs combined with significant weight reduction. Today, components are usually designed and calculated numerically by using finite element methods (FEM) to avoid expensive laboratory tests. These programs are based on material models including material sp...

Ultra-high performance concrete (UHPC) is a developing concrete and today is increasing to interest using it in structures due to its advantages such as high-compressive strength, modulus of elasticity, highly durability and low-permeability. Therefore, it is necessary to provide models for prediction of nonlinear behavior of this material. This study is aimed to investigate the tension-stiffen...

The aim of this study is to compare the metallic and natural fiber reinforced polymer composite bone plates used in humerus fractures. A 3D finite element model was developed to analyze the performance of both types of plates. This study proposed on fabrication of natural fiber powdered material (like Sisal (Agave sisalana), Banana (Musa sapientum) and Roselle (Hibiscus sabdariffa)) Reinforced ...

Decontamination and remote handled shredding of reinforced concrete is fundamental to the decommissioning process of nuclear installations. The main target is to select and remove the contaminated material and to return the remaining material to the regular recycling loop, since the contaminated material usually only provides for a fraction of the total mass. Various methods, which are continuo...

Guided-wave structural health monitoring (SHM) systems with piezoelectric sensors are investigated for localisation of barely visible impact damage in CFRP plates under vibration and different thermal conditions. A single baseline set is used in a delay-and-sum algorithm with temperature correction for damage localisation in a large temperature range. Damage localisation is also demonstrated un...