Conductors with high conductivity and stretchability are the crucial components of smart wearable electronics. However, most of the reported conductors have disadvantages of single function, high energy consumption, which seriously limit their application in wearable electronics. Here, a kind of stretchable (up to 373%), highly conductive (the same order of magnitude as commercial metal wire), and multifunctional sheath‐core fibers based on liquid metal that can be continuously fabricated in large quantity through a coaxial wet‐spinning process are reported. The simple preparation method of the fibers can realize continuous and mass production (1 m min–1 in the laboratory). When the fibers are used as an electric heater, the temperature can reach 58 °C at 0.6 V and the heating rate is obviously faster than the ambient temperature under infrared light. When the fibers are used as a wearable sensor, the tiny force of 0.001 cN can be detected and objects at less than 40 cm can be detected without contact. The stretchable fibers with high electric conductivity may provide strong supports for the commercialization of wearable electronics and pave the way toward full‐fledged multifunctional wearable sensors.

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The thermal stress of a multi-layer composite of plastic/brittle material was studied by the finite element method. High stress is found to be located on the interfaces between the plastic and the brittle material. 1-D and 2-D approaches for the determination of the temperature distributions in the multi-layer composite were examined. The 1-D approach gives an approximate 80 percent of error in temperature and a maximum of 20 percent of error in thermal stress in comparison with the 2-D approach. This suggests that, for a plastic/brittle composite, a 2-D approach for the determination of the temperature distribution should be taken in order to ensure the validity in the determination of both the temperature and stress distributions.