OPTIMAL DESIGN OF PIEZO-ACTUATORS IN A LAYERED COMPOSITE STRUCTURE

The effect of micro- and nano-scale heterogeneity on the indentation behavior of the composite structure was studied numerically using the finite element method. The material system of concern is the aluminum (Al)/silicon carbide (SiC) multilayered thin films above the silicon (Si) substrate. The numerical model features the explicit composite structure indented by a conical diamond indenter within the axisymmetric simulation framework. Attention is devoted to the evolution of stress and deformation fields in the layered composite during the indentation loading and unloading processes. It was found that the layered composite, consisting of materials with distinctly different mechanical properties, results in unique deformation patterns. Significant tensile stresses can be generated locally along certain directions, which offers a mechanistic rationale for the indentation-induced internal cracking observed experimentally. The unloading process also leads to an expansion of the tension-stressed area, as well as continued plastic flow in parts of the Al layers. Implications of these numerical findings to the nanoindentation response of metal-ceramic laminates are discussed.

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Basic design guidelines for embedded piezoactuators in a layered composite structure

10.1117/12.152772 ◽

1993 ◽

Author(s):

Alan R. Masters ◽

James D. Jones

Keyword(s):

Composite Structure ◽

Layered Composite ◽

Design Guidelines ◽

Basic Design

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Research on Dynamic Cumulative Damage Effect of Metal Rubber and Stress Wave Propagation Characteristics of Layered Composite Structure

Science of Advanced Materials ◽

10.1166/sam.2021.3997 ◽

2021 ◽

Vol 13 (5) ◽

pp. 981-990

Author(s):

Youchun Zou ◽

Chao Xiong ◽

Junhui Yin ◽

Kaibo Cui ◽

Huiyong Deng ◽

...

Keyword(s):

Stress Wave ◽

Composite Structure ◽

Composite Structures ◽

Impact Resistance ◽

Layered Composite ◽

Damage Effect ◽

Stress Wave Propagation ◽

Metal Rubber ◽

Layered Composite Structures ◽

The Impact

The development of protective materials and structures is of great significance for improving the impact resistance, penetration resistance and spalling resistance of military equipment. At present, the layered composite structure has been widely used due to its good protective performance. In this paper, a special elastic porous material-metal rubber (MR) with excellent cushioning and damping properties was used to prepare high-performance layered composite structures. To begin with, the dynamic mechanical response and the dynamic cumulative damage effect of MR were studied through Split-Hopkinson Pressure Bar (SHPB) tests. Then, the failure form and stress wave propagation characteristics of the layered composite structures were investigated through SHPB tests and finite element method. The results show that repeated impacts can enhance the compactness of MR, thereby increasing the ultimate bearing capacity and energy absorption capacity, which is beneficial for MR to resist repeated impacts. The MR in composite structures can reduce ceramic damage, attenuate stress wave and smooth stress distribution. The titanium alloy on the back of the ceramic will aggravate the damage of the ceramic, and ultra-high molecular weight polyethylene on the back of the ceramic provides cushioning for the ceramic. Therefore, the impact resistance of the composite structure can be improved by adding MR and the reasonable arrangement of materials, and the SiC/UHMWPE/MR/TC4 composite structure has relatively reasonable stress distribution and better protection performance.

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