Engineering design of materials and structures has evolved radically from earliest employment of single phase materials with a focus on optimization of geometric shapes to recent multiphase materials with tactful integration and assembly in both geometric shapes and material domains. In these recent design concepts and strategies, the interfaces are crucial and leveraged to achieve properties and functionalities surpassing those of individual material/phase components and/or their simple superpositions. This perspective focuses on the underpinned interface mechanics view in which insights are essential to understand fundamentals of integration, tailoring and assembly of multiphase materials with diverse geometric layouts. The view also provides insights to enable creations of intelligent new design concepts and approaches of materials and structures capable of being readily manufactured with current technologies. Selected examples of engineered materials and structures enabled by either solid-solid or solid-liquid interactions are provided to highlight the driving role of interface mechanics in designs and to outlook the associated future opportunities and challenges.

材料和结构的工程设计已经从最早使用单相材料（重点是优化几何形状）发展到了最近的多相材料（在几何形状和材料领域都进行了巧妙的集成和组装）。在这些最新的设计概念和策略中，接口至关重要，并被用来实现超越单个材料/相组件和/或其简单叠加的特性和功能。该观点侧重于基本的接口力学观点，其中洞见对于理解具有各种几何布局的多相材料的集成，定制和组装的基础至关重要。该视图还提供了洞察力，以实现能够采用当前技术轻松制造的智能化新设计概念以及材料和结构的方法。提供了通过固-固或固-液相互作用实现的工程材料和结构的选定示例，以突出界面力学在设计中的驱动作用，并展望相关的未来机遇和挑战。