I thought that bonds were a "fixed income" investment and I would preserve my capital.
When a bond is issued, there is a coupon rate set – or fixed -- for the life of the bond. The holder of the bond gets that as income semi-annually. Thus, “fixed income” – a term I feel is misleading. The price, or asset value, of the bond varies every day as the bond ages toward maturity. If the bond is held until maturity, the end value is predictable in nominal terms. A bond fund is a collection of bonds. Often (usually?), the fund will hold bonds for a certain portion of the yield curve. While this means the fund will target a certain risk profile, it will buy/sell bonds to maintain the portfolio. As interest rates go up, the price of the bond falls so that the resulting yield (based on coupon rate) is competitive. If rates go down, prices go up. Rate movements may result from fed action, market supply/demand, or just the bond aging down the yield curve.
It maybe instructive to look at last 40-something years of rate changes. Start back in early 1980s & rates were in high teens. By early 2001, effective fed rates were about 5.5%. While those rates fell, bond prices went up. In the 22 years since, rates went down to under .5% in late 2008 & changed little for about 10 years. Prices were stable. Recent runup in rates caused prices to fall; and a .25% hike from .25% has different impact than a .25% hike from 5.5%. When rates change, the price falls ‘immediately’, but the increased distribution changes slower for funds (doesn’t change at all for individual bonds).
An important part of future performance is what you do with the distribution – that is, spend vs reinvest. For example, if you reinvest distributions for a bond fund that pays monthly, the distribution will gradually rise over time & buy more shares as prices fall. Or vice versa, for a falling rate environment. One way to think about it is that a fund will have a more steady risk profile, but a variable distribution. Individual bonds will have a steady (in nominal terms) distribution, but risk varies (as defined as duration. This risk is usually mitigated by a buy/hold plan). You didn’t mention if you were already taking RMDs or if that is in the future.
Currently, imho, neither bonds nor bond funds will preserve capital in real terms, not nominal. Future performance will depend upon interest rate changes – magnitude and velocity-- & inflation. Rates have risen & inflation cooled over past months making it better than a year or so ago. Many that held bond funds during the falling/steady rate period didn’t really understand & thus there has been much emotion from those incurring unexpected losses.
Good luck