In the solar industry, China General Certification Center (CGC) is one of the first third-party organizations in China to certify and test solar photovoltaic (PV) products..
In the solar industry, China General Certification Center (CGC) is one of the first third-party organizations in China to certify and test solar photovoltaic (PV) products..
We have provided on-site witness testing services for UL certification of inverters of Shenzhen BYD. CCIC-SET has become the first UL-accredited laboratory for inverter products as well as the first laboratory applying for providing witness test service for UL certification of inverter. .
，： 、？ 、。 ，。 ，，、。 ？ ： ，？ 。 、，。 。 1. IEC. [pdf]
[FAQS about China solar container industry certification agency]
Dynamic modulus (sometimes complex modulus ) is the ratio of stress to strain under vibratory conditions (calculated from data obtained from either free or forced vibration tests, in shear, compression, or elongation). It is a property of materials. ，，。 ，，Maxwell，。 ：，，。 ，，，、。. .
，，。 ，，Maxwell，。 ：，，。 ，，，、。. .
G' > G'' ： （elastic solid), (Viscous fluids）。 “X”（1）， （2），。 G' < G''： 。 （，）. .
（storage modulus） ， 。 ，， [1] [3]。 ， ，Maxwell， [1-2]。 ：，， [3]。. .
σ ()＝Eε ()，σ，ε，E，，。 （ThomasYoung1773～1829），，。 1807，，。 (^_^) 2. E (Elastic Modulus) E ()，。 ，，，，）。. .
DMA (Dynamic Mechanical Analyzer)， (Storage Modulus)， (Loss Modulus)， (Tan delta) ()。 (Tg, Glass transition temperature)。 5， (Master curve)。 PCB: DMAPCB，、。 :. [pdf]
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