本研究利用自行研發的裂紋擴展量測系統與裂縫片量測系統，配合相關設備與試驗基座以及相關理論，進行一系列裂紋起裂與擴展之研究。將其結果扼要分敘如下：
(1)在裂紋擴展量測技術研發方面：經過評估本研究採用裂紋傳感片當傳感材料，對裂紋擴展速度進行監測是最佳的選擇。
(2)在裂紋擴展之分形特性方面：加載速率愈快，裂紋擴展平均速度也愈高。分形裂紋速度隨分形維數增加而增大。
(3)在亞臨界裂紋擴展之觀測方面：本研究量測並定義出裂紋尖端附近之起裂載重、亞臨界載重、亞臨界擴展長度、穩定與非穩定下的裂紋擴展速度。
(4)在圓盤劈裂試驗觀測裂紋擴展速度方面：透過裂紋擴展量測系統以及裂縫片量測系統針對同一試體AB兩側進行裂紋擴展速度量測，得到裂紋擴展平均速度是很接近的。
(5)在含傾斜單裂紋試體之單軸壓縮試驗方面：透過相關斷裂準則了解，PMMA試件在裂紋尖端產生翼裂紋是因為拉力破壞；砂岩試件在裂紋尖端產生反翼裂紋是因為剪力破壞。裂紋起裂、擴展、裂紋擴展速度以及應變能密度均會受裂紋傾斜角度影響。

This study presents crack velocity measurement and crack strain gage systems. A series of investigations on crack initiation and propagation were conducted. The results are stated as follows:
(1)With respect to crack measurement technique research and development: A crack detection sensor was used as the sensing material in this study because it is the best choice for monitoring crack propagation velocity.
(2)With respect to crack propagation fractal characteristics: The faster the loading rate is, the higher the average crack velocity. The fractal crack velocity rises with the increase in fractal dimensions.
(3)In terms of subcritical crack propagation observations: The initiation load, subcritical load, subcritical crack propagation length and crack propagation velocity under stable and unstable conditions in the vicinity of the crack tip were measured and defined.
(4)With regard to crack propagation velocity observations in the notched disc edge test: Using the crack velocity measurement system and crack strain gage system, the crack propagation velocity was measured at both sides of A and B in the same specimen. The average crack velocities obtained for both sides were close to each other.
(5)With regard to uniaxial compression tests on the single inclination flaw specimen: Using the relevant fracture criteria, we can learn that wing crack emergence at the crack tip of the PMMA specimen is due to tensile failure. The anti-wing crack at the crack tip of the sandstone specimen is due to shear failure. Crack initiation, propagation, crack propagation velocity and strain energy density are all affected by the crack inclination angle.

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