Composites based on candle wax and pencil graphite were fabricated with different concentrations of graphite in the range 0% w/w to 70% w/w. These composites were fabricated (‘ironed’) into a sandwich structure with kitchen aluminum foil serving as electrodes. The composites’ electrical resistance was measured and it was found that the composite with 15% w/w of graphite was the best choice for further investigation according to the percolation theory of electrical conductivity thresholds. The wax–graphite composites were subjected to impact forces from a basketball, measured by the school’s PASCO equipment. A calibration curve of the specific electrical resistance versus the force of impact was constructed. Following the standards of the International Basketball Federation (FIBA), the quality of the basketball was evaluated in terms of the bounce height of a free-falling ball and the force acting on the ball during the impact with the floor. The wax–graphite composite with a thr...

中文翻译：

---

电渗流阈值理论增强了复合材料和传感器的实践实验室

以0％w / w至70％w / w范围内的不同浓度的石墨制造基于蜡烛蜡和铅笔状石墨的复合材料。这些复合材料被制成（“熨烫”）成三明治结构，其中厨房用铝箔充当电极。测量了复合材料的电阻，发现根据电导率阈值的渗流理论，石墨含量为15％w / w的复合材料是进一步研究的最佳选择。蜡-石墨复合材料受到篮球的冲击力，这是由学校的PASCO设备测得的。绘制了比电阻与冲击力的校准曲线。按照国际篮球联合会（FIBA）的标准，通过自由落下的球的弹跳高度和在与地板碰撞时作用在球上的力来评估篮球的质量。蜡-石墨复合材料