This paper studies aligned glass fiber-reinforced composites for printing. To determine the influence of fiber content and alignment on mechanical properties this novel material, a large number standard test specimens were prepared, which included samples fabricated by mold-casting, randomly dispersed reinforced mixtures cement containing 10 types volume ratios manufactured nozzle sizes ranging 24 mm (fiber length = 12 mm). Mechanical failure modes under compression flexural tests studied...

Floating raft is a typical vibration-reducing structure, which widely used in the field of ships. Aiming at vibration reduction requirements power modules motor, shafting and other equipment, this paper presents plate-frame structure scheme, analyzes influence plate thickness different components on characteristics by finite element method, identifies main modes based mass normalization method. The analysis shows that variation upper panel, lower longitudinal bone rib has complex principal...

Abstract To address the issues of long setting times and self-shrinkage large volume effects general ultra-high-performance concrete that hinder its application in bridge reparation reinforcement, this study employs iron aluminate cement as a functional admixture component, supplemented with lithium carbonate to regulate early performance concrete. Additionally, pre-wetted lightweight aggregates are used collaboratively enhance stability concrete, produce an ultra-early-strength suitable for...

Perfobond rib (PBL) shear connectors, made up of the perforated steel plates with penetrating rebars passing through holes, are extensively adopted in steel-concrete composite structures for their excellent performance. The adequate understanding mechanical properties PBL connectors is great significance reasonable design. In this study, a push out experiment, including 12 specimens parameters concrete strength, diameter and number holes on plate, was performed to explore behavior fiber high...

Abstract Transparent fracture models were constructed to visually track swollen preformed particle gel (PPG) propagation through open fractures and water flow PPG placed in fractures. It was observed that propagated like a piston along during injection pack formed the after placement broke create several channels discharge from outlet placement. The factors influence injectivity plugging efficiency have been investigated. Results show increases with width rate decreases brine concentration...

Abstract Purpose The purpose of this paper is to establish a new two-phase Discrete Element Method (DEM) model investigate the movement fresh concrete which consists mortar and aggregate. established DEM was adopted simulate mixing process based on commercial software package PFC3D. trajectories particles particle clusters were recorded analyze behavior from different scales. On one hand, macro-scale obtained make visualization. other relative micro single also monitored further study...

Abstract Fresh concrete is a typical thixotropy material with time-dependent rheological characteristic. In this study, general Discrete Element Method (DEM) model for the fresh was firstly established and calibrated by tests contact parameters verified. Then, of considered introducing parameter into DEM model. Based on model, lateral pressure wall numerically investigated where changing characteristic over time validated influence yield stress addressed. The simulative results were found in...

The coarse aggregate is the framework of fresh concrete and thus plays an important role in its flow behavior. A discrete element method (DEM) model for was established validated by a rheometer test with contact parameters verified. Firstly, used to study effect volume fraction on yield stress. Then based DEM model, pumping process simulated which pressure wear wall were addressed. It shown that both degree increase fraction.

Nanocrystalline cellulose (NCC) was used to improve the anti-yellowing property of polyurethane (PU). The NCC modified with 3-glycidoxypropyltrimethoxysilane (GPTMS) enhance its compatibility PU, and surface-modified characterized by contact angle (CA), X-ray powder diffraction (XRD), thermogravimetric analysis (TG). NCC/PU composite examined scanning electron microscopy (SEM), Fourier transform infrared spectrophotometer (FT-IR), photoelectron spectroscopy (XPS). Anti-yellowing determined...

An adequate discharging homogeneity of fresh concrete is the benefit avoiding segregation and pipe blocking. In this article, discrete element method was used to simulate process in truck mixer. GB/T 9142 examine through five samples. It found that content coarse aggregate higher first fifth samples but lower third sample than standard C30 concrete. The second fourth others. These findings are consistent with experimental observations. Moreover, deviation proposed scale mixture, which could...

Bioinspired design has been applied in sustainable (e.g., lightweight structures) to learn from nature and support material structure functionalities. Natural structures usually require modification practice because they were evolved natural environmental conditions that can be different industrial applications. Topology optimization is a method find the optimal solution by considering external physical environment. Therefore, integrating topology into bioinspired benefit designers meeting...