The special energy-absorbing structure of beak protects the head of woodpecker from being hurt when pecking tree. Inspired by the micro wavy structure of the woodpecker beak, a novel bionic sinusoidal honeycomb is proposed and its crashworthiness performance is analyzed. Results show that the bionic sinusoidal honeycomb produces more folds than the conventional honeycomb under the same mass conditions, which greatly improves the energy absorption effect. Compared with the conventional honeycomb, although the initial peak crushing force of bionic sinusoidal honeycomb is generally higher (the change ranges from −1.64% to 11.84%), the specific energy absorption of all bionic sinusoidal honeycombs is much better (the increase ranges from 30.12% to 80.99%). Moreover, the bionic sinusoidal honeycomb has a better crush force efficiency when the amplitude is small. A comprehensive comparison of the impact resistance of the bionic sinusoidal honeycomb and conventional honeycomb shows that the proposed bionic sinusoidal honeycomb has better energy absorption and application scalability than the conventional honeycomb.

A new type of axially varying thickness lateral corrugated tube (AVTLCT) is proposed and optimized, and the energy absorption and multi-objective optimization of the two AVTLCTs with the number of corrugations (N) of 6 and 10 are analyzed. Research shows that for the AVTLCT with N = 6, the value ranges of A and k for the Pareto front are more evenly distributed, which implies that the AVTLCT with N = 6 has better scalability than the AVTLCT with N = 10. Compared with the original design, the optimized solution has a maximum increase of 55.36% in SEA and a maximum reduction of 69.88% in F_max.

In this article, we present a graphical Computer-Aided Design (CAD) environment for the design, analysis, and layout of Carbon NanoTube (CNT) Field-Effect Transistor (CNFET) circuits. This work is motivated by the fact that such a tool currently does not exist in the public domain for researchers. Our tool has been integrated within Electric a very powerful, yet free CAD system for custom design of Integrated Circuits (ICs). The tool supports CNFET schematic and layout entry, rule checking, and HSpice/VerilogA netlist generation. We provide users with a customizable CNFET technology library with the ability to specify λ-based design rules. We showcase the capabilities of our tool by demonstrating the design of a large CNFET standard cell and components library. Meanwhile, HSPICE simulations also have been presented for cell library characterization. We hope that the availability of this tool will invigorate the CAD community to explore novel ideas in CNFET circuit design.