A B S T R A C TThe interface moving crack between the functionally graded coating and infinite substrate structure with free boundary is investigated in this paper. By application of the interface bonding conditions of the two media, all the quantities have been represented by means of a single unknown function. With the help of the exponent model of the shear modulus and density, the dual integral equation of moving crack problem is obtained by Fourier transform. The displacement is expanded into series form using Jacob Polynomial, and then the semi-analytic solution of dynamic stress intensity factor is derived by Schmidt method. Dynamic stress intensity factor is influenced by those parameters such as crack velocity, graded parameter and coating height.
High melting viscosity of thermoplastic composites gives no way of using substantial volume fractions of reinforcing agents. This problem can be solved by in-situ polymerization of an extremely low-viscosity cyclic butylene terephthalate (CBT) resin. Continuous glass fiber-reinforced poly(cyclic butylene terephthalate) (GF/ðCBT) composites with high fiber fractions were manufactured, and the mechanical properties as a function of the catalyst mass fraction and fiber filling ratio were studied. The longitudinal tensile strength of the composites was enhanced by increasing the fiber volume fraction, and the influence of the fiber fraction on the bending strength of high fiber filling-ratio composites was evaluated. Furthermore, the mechanical properties and failure modes of GF/ðCBT fusion-bonded joints with different number of bonding areas of different lengths were investigated. It was found that high-strength composite materials can be obtained, which are applicable for fusion-bonded structures..
Êîëëåäae àýðîêîñìè÷åñêîãî è ãðàaeäàíñêîãî ñòðîèòåëüñòâà, Õàðáèíñêèé èíaeåíåðíûé óíèâåðñèòåò, Õàðáèí, Êèòàé  ðàìêàõ ïîäõîäà ìîëåêóëÿðíîé ñòðóêòóðíîé ìåõàíèêè èññëåäóåòñÿ âëèÿíèå äâîéíûõ àòîìàðíûõ âàêàíñèîííûõ äåôåêòîâ êðèñòàëëè÷åñêîé ðåøåòêè íà óïðóãèå ñâîéñòâà îäíîñëîéíûõ ëèñòîâ ãðàôåíà ñ çèãçàãîîáðàçíîé è ïëåòåíîé ñòðóêòóðîé. Äëÿ ìîäåëèðîâàíèÿ ìåaeàòîìíûõ ñèë ñâÿçåé òèïà óãëåðîä-óãëåðîä èñïîëüçóåòñÿ ïðîñòðàíñòâåííàÿ ñòðóêòóðíàÿ ñåòêà. Ðåçóëüòàòû ÷èñëåííîãî ìîäåëèðîâàíèÿ, ïîëó÷åííûå ìåòîäîì êîíå÷íûõ ýëåìåíòîâ, ïîäòâåðaeäàþò, ÷òî íàëè÷èå óêàçàííûõ âàêàíñèîííûõ äåôåêòîâ ñíèaeàåò ìîäóëü óïðóãîñòè ãðàôåíà, ÷òî ïðèâîäèò ê óìåíüøåíèþ åãî íåñóùåé ñïîñîáíîñòè. Óñòàíîâëåíî, ÷òî óâåëè÷åíèå êîëè÷åñòâà âàêàíñèîííûõ äåôåêòîâ îáóñëîâëèâàåò ñíèaeåíèå ìîäóëÿ óïðóãîñòè è êîýôôèöèåíòà Ïóàññîíà îäíîñëîéíûõ ëèñòîâ ãðàôåíà. Êëþ÷åâûå ñëîâà: ãðàôåí, äâîéíûå àòîìàðíûå âàêàíñèîííûå äåôåêòû, óïðóãèå ñâîéñòâà, õèðàëüíîñòü, ìîëåêóëÿðíàÿ ñòðóêòóðíàÿ ìåõàíèêà. Introduction. Graphene is a new type of low-dimensional carbon material, which emerged after the discovery of fullerenes and carbon nanotubes. Due to its single atomic layer thickness, graphene is considered to be a two-dimensional material, which consists of carbon atoms in a honeycomb lattice structure. Since its news-breaking appearance in 2004 [1], graphene has received significant attention due to its outstanding physical properties such as high thermal conductivity [2], stiffness, and strength [3]. However, the issue of mechanical properties of single-layered graphene sheets (SLGS) being impaired by atom vacancy defects has received scarce attention yet. However, due to limitations in the graphene production, imperfections, such as adatoms, Stone-Wales defects, line defects, and vacancies of atoms cannot be avoided in graphene nanostructures [4]. Of these, the vacancy defects are the most typical for graphene and strongly affect the mechanical properties of SLGS. Therefore, it is of high theoretical significance and practical importance to study the influence of double-atom vacancy defects (DAVD) on the mechanical properties of SLGS. Numerous researchers have investigated the elastic properties of graphene using various theoretical methods. Thus, Pei et al. applied the molecular dynamics approach to estimate the elastic modulus values for different chirality graphenes, including the so-called
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