Textile Circuit Board Can Block Bullets, Strong Flexibility And No Fear Of Cleaning.

We all know that we are using the latest.

We can print out the electronic circuit board by 3D.

But there is one drawback to this new technology: printed circuit boards are not flexible.

However, researchers at Hong Kong Polytech University have developed a FCB, which has strong flexibility and is not afraid of cleaning.

This new

It has excellent tensile properties. It can stretch 300% and fold 1 million times.

Researchers at Hong Kong Polytech University, in developing FCB, use a computer knitting technology, and fuse conductive fiber metal materials and traditional fibers. These materials are like circuits on ordinary circuit boards. Fiber acts as a suture material to ensure that all circuits are in place, as well as insulators between different circuits.

The researchers said that

It can be stretched, cleaned, spliced, knitted, etc.

At present, relevant papers have been published in the latest issue of the proceedings of the Royal Society.

The researchers say the new material has excellent tensile properties, stretching it 300%, folding it 1 million times, and even holding the bullet.

This material is expected to be applied to smart phones, wearable devices or military devices in the future.

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Cement is an important raw material for preparing cement mortar, concrete and various cement products. It is one of the most important building materials in civil engineering.

Although cement has good strength and constructability, cement mortar, concrete and its products have defects of poor crack resistance, which are prone to dry shrinkage cracks and temperature cracks.

These cracks are constantly changing and developing over time, and the tiny cracks are expanding and eventually developing into larger cracks.

Therefore, the research on the performance and application of anti crack modified cement is of great significance for improving the performance and durability of engineering structures.

The high strength and high elastic modulus PVA fiber used in concrete has the advantages of high strength, high modulus of elasticity, low elongation and good dispersibility. It also has the characteristics of acid resistance, alkali resistance, salt resistance, abrasion resistance and corrosion resistance. It is nontoxic, pollution-free and harmless to human body. It has good affinity and combination with cement based materials. It is an excellent crack resistant, anti-seepage and reinforced material for cement concrete.

At present, in China's asphalt pavement, the "strong base thin surface" theory is widely used, and the semi-rigid base of cement stabilized crushed stone is widely used.

The cement stabilized macadam base after the completion of the construction is affected by the drying shrinkage stress, temperature shrinkage stress and the upper load stress. The local stress concentration phenomenon is prone to occur in the base layer, resulting in cracks at the weak connection point.

This is also one of the important reasons for premature pavement damage in China.

It is found that adding PVA fibers into cement stabilized macadam mixture to form crack resistant base can improve this phenomenon.

The plastic tensile strength of materials against cracking is increased by the interfacial adhesion and adhesion between fiber and cement stabilized macadam mixture, so that the cracking status of cement stabilized macadam can be reduced or even disappeared.

In the experimental study on the crack resistance of the expressway in the Hefei Xinqiao International Airport, the anti cracking base is mixed with 20mm 30mm polyvinyl alcohol fibers in the cement stabilized macadam, and the dosage is 0.9 kg/m3 to 1.2kg/m3, so as to improve the crack resistance of the base.

The cracks of cement stabilized macadam mixed with PVA fiber are reduced by more than 90% compared with ordinary water stability. The mix proportion and material requirements of anti cracking cement stabilized macadam are the same as those of normal cement stabilized macadam.

In order to distribute the fibers evenly in cement stabilized macadam mixture, a mixing process should be added to the construction of normal cement stabilized macadam, anti crack and water stabilized macadam.

Fiber length and volume have certain effect on compressive strength of cement stabilized macadam, but little effect.

Generally speaking, synthetic fiber concrete has been widely studied and applied abroad.

At present, the use of synthetic fiber concrete in the United States accounts for 7% of the total volume of concrete, and the number of synthetic fiber concrete has far exceeded that of steel fiber reinforced concrete developed in advance.

The further popularization and application of PVA fiber in engineering also requires the aging and fatigue tests under the condition of long-term use.