Diamond-like carbon (DLC) is one of the rising film materials in the aerospace, automobile and valve applications, for its inherent and unique properties in anti-wear and low friction. In this paper, an interfacial mechanics model of film-substrate system was established to evaluate the stresses and deformations at the interface of DLC-G95Cr18 film-substrate system accurately. A microscratching test was used to measure the load-carrying capacity of the DLC-bearing steel by ball on disc mode. The failure of this film-substrate system was determined using the acoustic emission and friction force signal simultaneously. Then, the interfacial stresses and deformations were calculated by using the established model and the design algorithm. Both of the experimental and computational results showed that hard DLC film would experience a failure process of elastic-plastic deformation, which caused by the interfacial stresses and initial cracks. During the brittle fracture of DLC film, shear stresses were the main cause of the initial cracks. And the evolution of stress and deformation in the process of microscratching and the critical failure state under its critical load were analyzed. These result could be utilized in the analysis of the load-carrying capacity and the failure mechanism of DLC-G95Cr18 film-substrate system.

类金刚石碳 (DLC) 是航空航天、汽车和阀门应用中新兴的薄膜材料之一，因为其在抗磨损和低摩擦方面具有固有和独特的特性。为了准确评估DLC-G95Cr18薄膜-基体系统界面的应力和变形，本文建立了薄膜-基体系统的界面力学模型。微划痕测试用于通过球盘模式测量 DLC 轴承钢的承载能力。同时使用声发射和摩擦力信号确定该薄膜-基材系统的故障。然后，利用建立的模型和设计算法计算界面应力和变形。实验和计算结果都表明，硬质 DLC 薄膜会经历弹塑性变形的破坏过程，这是由界面应力和初始裂纹引起的。在DLC薄膜脆性断裂过程中，剪切应力是产生初始裂纹的主要原因。并分析了微划痕过程中应力和变形的演变及其临界载荷下的临界失效状态。这些结果可用于分析DLC-G95Cr18薄膜-基材系统的承载能力和失效机理。并分析了微划痕过程中应力和变形的演变及其临界载荷下的临界失效状态。这些结果可用于分析DLC-G95Cr18薄膜-基材系统的承载能力和失效机理。并分析了微划痕过程中应力和变形的演变及其临界载荷下的临界失效状态。这些结果可用于分析DLC-G95Cr18薄膜-基材系统的承载能力和失效机理。